難度：★    考點：動詞時態

　　1. After hard training for a long time, Liu Xiang                the records again.

　　A. broke            B. achieved            C. invented            D. completed

　　2. －Do you enjoy ______ a volunteer?

　　－If you want _______ this, you'd better join us.

　　A. being; knowing        B. to be; knowing        C. being; to know      D. to be; to know

　　3. －I called you this morning, but nobody answered it.

　　－Oh, we _____ some running in the park.

　　A. are doing        B. were doing        C. have done        D. did

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