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

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

2.填空題We’d like （）(預(yù)訂一張餐桌) five for dinner this evening.

3.填空題The price of beer（）(從50美分到4美元不等) per liter during the summer season.

4.填空題Although punctual himself, the professor was quite used（）(習(xí)慣了學(xué)生遲到) his lecture.

5.填空題Over a third of the population was estimated（）(無法獲得) to the health service.

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