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    Male business executive giving a speech at conference center — Stock Photo
    Male business executive giving a speech at conference center
    Mother helping children with homework in kitchen at home — Stock Photo
    Mother helping children with homework in kitchen at home
    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
    Rear view of female business executive giving a speech at conference center — Stock Photo
    Rear view of female business executive giving a speech at conference center
    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
    Male speaker on stage answering audience questions — Stock Photo
    Male speaker on stage answering audience questions
    Teacher and students with hands raised in adult education class — Stock Photo
    Teacher and students with hands raised in adult education class
    Chinese schoolgirl asking teacher a question — Stock Photo
    Chinese schoolgirl asking teacher a question
    Eager girl students raising arms behind microscopes in laboratory classroom — Stock Photo
    Eager girl students raising arms behind microscopes in laboratory classroom
    Schoolboy raising hand — Stock Photo
    Schoolboy raising hand
    Golden retriever dog on beach looking up at owner — Stock Photo
    Golden retriever dog on beach looking up at owner
    Teacher calling on students with hands raised in adult education classroom — Stock Photo
    Teacher calling on students with hands raised in adult education classroom
    Female speaker on stage answering audience questions — Stock Photo
    Female speaker on stage answering audience questions
    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
    African american students raising hands in class — Stock Photo
    African american students raising hands in class
    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.
    High school students with hands raised in debate class — Stock Photo
    High school students with hands raised in debate 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
    Cute little girl standing looking at camera with a blackboard as a bac — Stock Photo
    Cute little girl standing looking at camera with a blackboard as a bac
    Worried senior man sitting in bedroom holding medicine and talking on mobile phone — Stock Photo
    Worried senior man sitting in bedroom holding medicine and talking on mobile phone
    African american student raising hand in class — Stock Photo
    African american student raising hand in class
    High school teacher calling on students during lesson in classroom — Stock Photo
    High school teacher calling on students during lesson in classroom
    Girls and boys in a classroom — Stock Photo
    Girls and boys in a classroom
    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
    Conference audience watching speakers on stage — Stock Photo
    Conference audience watching speakers on stage
    Male teacher calling on students in classroom — Stock Photo
    Male teacher calling on students in classroom
    Businesswoman leading meeting, answering audience questions — Stock Photo
    Businesswoman leading meeting, answering audience questions
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Speaker on stage answering audience questions — Stock Photo
    Speaker on stage answering audience questions
    High school students with hands raised during lesson in classroom — Stock Photo
    High school students with hands raised during lesson in classroom
    Teacher talking to black students at chalkboard — Stock Photo
    Teacher talking to black students at chalkboard
    High school girl student raising hand, asking question during lesson in classroom — Stock Photo
    High school girl student raising hand, asking question during lesson in classroom
    Conference audience with hands raised for speaker on stage — Stock Photo
    Conference audience with hands raised for speaker on stage
    High school students with hands raised during lesson in classroom — Stock Photo
    High school students with hands raised during lesson in classroom
    A group of Caucasian boys and girls listening to instructions from a Caucasian male fitness coach at a boot camp on a sunny day, sitting on the grass and raising their hands — Stock Photo
    A group of Caucasian boys and girls listening to instructions from a Caucasian male fitness coach at a boot camp on a sunny day, sitting on the grass and raising their hands
    Worried senior woman sitting in bedroom holding medicine and talking on mobile phone — Stock Photo
    Worried senior woman sitting in bedroom holding medicine and talking on mobile phone
    Crop forearm of african-american man raising hand against pink background — Stock Photo
    Crop forearm of african-american man raising hand against pink background
    Men drawing on paper — Stock Photo
    Men drawing on paper
    Teacher talking to african american students at chalkboard — Stock Photo
    Teacher talking to african american students at chalkboard
    Girls and boys in a classroom — Stock Photo
    Girls and boys in a classroom
    Smiling male science teacher leading lesson at whiteboard in classroom — Stock Photo
    Smiling male science teacher leading lesson at whiteboard in classroom
    Eacher teaching mathematics to children — Stock Photo
    Eacher teaching mathematics to children
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Student raising hand for asking query in training institute — Stock Photo
    Student raising hand for asking query in training institute
    Side view of a cute little blonde girl erasing the blackboard with an — Stock Photo
    Side view of a cute little blonde girl erasing the blackboard with an
    Woman giving an interview to journalists — Stock Photo
    Woman giving an interview to journalists
    High school students with arms raised, asking questions in classroom — Stock Photo
    High school students with arms raised, asking questions in classroom
    Man with laptop and apple core with asking spaniel dog on balcony — Stock Photo
    Man with laptop and apple core with asking spaniel dog on balcony
    Front view of a middle aged African female school teacher standing at the front of the class in front of the blackboard with the rear view of pupils sitting at their desks with hands raised in the foreground during a lesson — Stock Photo
    Front view of a middle aged African female school teacher standing at the front of the class in front of the blackboard with the rear view of pupils sitting at their desks with hands raised in the foreground during a lesson
    Female business executive giving a speech at conference center — Stock Photo
    Female business executive giving a speech at conference center
    Children raising hands — Stock Photo
    Children raising hands
    Businesswoman in audience asking question at business conference — Stock Photo
    Businesswoman in audience asking question at business conference
    Group of school kids wearing protective mask to Protect Against Covid-19 with teacher sitting in classroom,education,elementary school,Social Distancing,learning and people concept. — Stock Photo
    Group of school kids wearing protective mask to Protect Against Covid-19 with teacher sitting in classroom,education,elementary school,Social Distancing,learning and people concept.
    Diver asking buddy how much air he has left using hand signal — Stock Photo
    Diver asking buddy how much air he has left using hand signal
    Mother helping children with homework in kitchen at home — Stock Photo
    Mother helping children with homework in kitchen at home
    African american students raising hands in class — Stock Photo
    African american students raising hands in class
    Eacher teaching mathematics to children — Stock Photo
    Eacher teaching mathematics to children