题目内容

This remarkable ____(achieve) of the scientist was the result of a year’s hard work.

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Researchers have discovered in their study that boys and girls may behave ____(different).

I saw a bicycle ____(knock) down by a heavy truck at the crossing.

Mr. Wang spent the whole day ____(correct) his students’ exam papers.

The chairman required that every speaker ____(limit) himself to 15 minutes.

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