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THE SURVEY WAS BASED ON DIRECT ... OF OVER 500 SCH...
THE SURVEY WAS BASED ON DIRECT ... OF OVER 500 SCHOOLS. (OBSERVE)
ON TAP KIEM TRA 1T U4U6
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6. The survey was based on direct ... of over 500 schools. (observe)
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6.
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ON TAP KIEM TRA 1T U4U6