题目内容
The __________ of new working practices has greatly improved productivity (生产率).
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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.
In that battle our soldiers __________ through the bushes towards the enemy secretly.
Yesterday I saw two cars __________ at the crossing and burst into flames.
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