難度：★ 考點：動詞時態(tài)
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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