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填空題

The ship’s generator broke down and the pumps（）(不得不用手工操作) instead of mechanically.

答案： had to be operated manually

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It may be necessary to stop（）(每隔一定時(shí)間) in the learning process and go back to the difficult points in the lessons.

答案： at intervals

There’s a man at the reception desk who seems very angry and I think he means（）(想找麻煩).

答案： to make trouble