（）是指职工、农民和街道居民自愿参加的，以增进身心健康为主要目的，内容丰富、形式灵活的体育活动。
A. 社区体育
B. 社会体育
C. 学校体育
D. 休闲体育
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______ , I found all the seats were taken.
A.To enter the classroom
B.Entered the classroom
C.Entering the classroom
D.To be entered the classroom
______ in simple English, the book is easy to understand.
A.Writing
B.Written
C.To write
D.Being writing
Look, this roof is covered with-________leaves.
A. falling
B. fallen
C. fell
D. felt
Can you make yourself ______ in English?
A.understand
B.understood
C.understanding
D.to be understood
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