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    Chinese schoolgirl asking teacher a question — Stock Photo
    Chinese schoolgirl asking teacher a question
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Conference audience watching speakers on stage — Stock Photo
    Conference audience watching speakers on stage
    Student asking query to the trainer in training institue — Stock Photo
    Student asking query to the trainer in training institue
    Schoolgirl raising hand — Stock Photo
    Schoolgirl raising hand
    Mother helping children with homework in kitchen at home — Stock Photo
    Mother helping children with homework in kitchen at home
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, raising his hand to answer a question, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, raising his hand to answer a question, with teenage male and female classmates sitting at desks working in the background
    Teacher talking to black students at chalkboard — Stock Photo
    Teacher talking to black students at chalkboard
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Two dogs in downward dog pose asking to play — Stock Photo
    Two dogs in downward dog pose asking to play
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Men drawing on paper — Stock Photo
    Men drawing on paper
    Children raising hands — Stock Photo
    Children raising hands
    High school students with hands raised, asking questions during lesson in classroom — Stock Photo
    High school students with hands raised, asking questions during lesson in classroom
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach — Stock Photo
    A group of Caucasian boys and girls at a boot camp on a sunny day, sitting on the grass, smiling and raising their hands, volunteering to an unseen fitness coach
    Man speaking to guilty girlfriend in speech bubble — Stock Photo
    Man speaking to guilty girlfriend in speech bubble
    Crop forearm and hand of african-american man raising his index finger against yellow background — Stock Photo
    Crop forearm and hand of african-american man raising his index finger against yellow background
    Junior high school student raising hand, asking a question during lesson in classroom — Stock Photo
    Junior high school student raising hand, asking a question during lesson in classroom
    Couple talking, text on background — Stock Photo
    Couple talking, text on background
    Rear view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question, their male teacher standing in the background — Stock Photo
    Rear view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question, their male teacher standing in the background
    Mother helping daughter with homework in kitchen at home — Stock Photo
    Mother helping daughter with homework in kitchen at home
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    High school students with hands raised asking questions during lesson in classroom — Stock Photo
    High school students with hands raised asking questions during lesson in classroom
    Woman giving an interview to journalists — Stock Photo
    Woman giving an interview to journalists
    High school boy student with hand raised during lesson in classroom — Stock Photo
    High school boy student with hand raised during lesson in classroom
    Cute boy raising finger — Stock Photo
    Cute boy raising finger
    Khao Yai National Park, Thailand, Asia; Monkey Begging standing on road — Stock Photo
    Khao Yai National Park, Thailand, Asia; Monkey Begging standing on road
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    Man looking out from question mark — Stock Photo
    Man looking out from question mark
    Female speaker with microphone in wheelchair on stage — Stock Photo
    Female speaker with microphone in wheelchair on stage
    Smiling female science teacher leading lesson at whiteboard in classroom — Stock Photo
    Smiling female science teacher leading lesson at whiteboard in classroom
    Side view close up of multi-ethnic group of smiling high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view close up of multi-ethnic group of smiling high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Schoolboy raising hand in classroom — Stock Photo
    Schoolboy raising hand in classroom
    Chinese waiter taking order from woman at restaurant — Stock Photo
    Chinese waiter taking order from woman at restaurant
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    High school teacher calling on students with hands raised in classroom — Stock Photo
    High school teacher calling on students with hands raised in classroom
    African american students raising hands in class — Stock Photo
    African american students raising hands in class
    Question mark under judge gavel — Stock Photo
    Question mark under judge gavel
    Pretty ethnic woman in white t-shirt and jeans leaning on green door and looking at camera with finger on lips like silence sign — Stock Photo
    Pretty ethnic woman in white t-shirt and jeans leaning on green door and looking at camera with finger on lips like silence sign
    Male business executive giving a speech at conference center — Stock Photo
    Male business executive giving a speech at conference center
    Crop forearm and hand of african-american man raising his index finger against yellow background — Stock Photo
    Crop forearm and hand of african-american man raising his index finger against yellow background
    Security guard asking in the passenger to stop for the security check-in the airport terminal — Stock Photo
    Security guard asking in the passenger to stop for the security check-in the airport terminal
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    African american students raising hands in class — Stock Photo
    African american students raising hands in class
    Crop forearm of african-american man raising hand against pink background — Stock Photo
    Crop forearm of african-american man raising hand against pink background
    Chinese man ordering to female waitress in coffee shop — Stock Photo
    Chinese man ordering to female waitress in coffee shop
    Girl asking to pet cat at table outdoors — Stock Photo
    Girl asking to pet cat at table outdoors
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Eacher teaching mathematics to children — Stock Photo
    Eacher teaching mathematics to children
    Caucasian couple enjoying their time at a beach during sunset, a man is kneeling and proposing to a woman — Stock Photo
    Caucasian couple enjoying their time at a beach during sunset, a man is kneeling and proposing to a woman
    Teacher calling on student with hand raised in adult education classroom — Stock Photo
    Teacher calling on student with hand raised in adult education classroom
    Male high school teacher leading lesson at projection screen in classroom — Stock Photo
    Male high school teacher leading lesson at projection screen in classroom
    Man talking at press conference — Stock Photo
    Man talking at press conference
    Smiling business people asking a question in conference audience — Stock Photo
    Smiling business people asking a question in conference audience
    Young girl asking for help from her father while he reads the newspaper at home. — Stock Photo
    Young girl asking for help from her father while he reads the newspaper at home.
    Businesswoman leading conference presentation, answering audience questions — Stock Photo
    Businesswoman leading conference presentation, answering audience questions
    Girls and boys in a classroom — Stock Photo
    Girls and boys in a classroom
    Rear view of boy raising hand — Stock Photo
    Rear view of boy raising hand
    Girl and boys in a classroom — Stock Photo
    Girl and boys in a classroom