题目内容
A little __________ is a dangerous thing.
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Teachers are not supposed to have __________, but they always do.
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.
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