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11. Do you agree or disagree? It is difficult for teachers to be both popular (liked by students) and effective in helping students in learning. Give your reasons and specific examples.练习人数： 9
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12.练习人数： 34
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13.练习人数： 82
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14.练习人数： 20
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15.练习人数： 18
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16.练习人数： 63
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17.练习人数： 7
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18.练习人数： 7
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19.练习人数： 0
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20.练习人数： 0
