提问者：zilongpf

正文

How time flies. Is'two years since we gather here to (1) give Professor Smith a heaty welcome in a hall. For the (2) past two years, Profressor Smith worked very hard and we (3) learnde a lot from him.His lesson were interesting and (4) lively.He taught our oral English.Now most of us can (5) speak English very smooth.Now,he is returning to the (6) U.S. 请解释一下原因，谢啦！

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