题目内容
Teachers are not supposed to have __________, but they always do.
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Once she starts a book, she always finishes it, even if it's really __________ .
The __________ of new working practices has greatly improved productivity (生产率).
Nowadays young people often go to a karaoke bar, where they can __________ whatever song they like to sing.
It appeared to be true, but I had a(n) __________ that she was not telling me the truth.
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