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21. Some people believe that video games could inspire young students interest and make their study more efficient rather than distracting them and a waste of time, so young students should be allowed to play video games.练习人数： 7
-
22.练习人数： 9
-
23.练习人数： 31
-
24.练习人数： 22
-
25.练习人数： 8
-
26.练习人数： 24
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27.练习人数： 26
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28.练习人数： 7
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29.练习人数： 6
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30.练习人数： 14
