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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.
答案:
at intervals
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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
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We’d like ()(預訂一張餐桌) five for dinner this evening.
答案:
to reserve a table for
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