A. cleaned B. is cleaned C. was cleaned D. cleans
A. in hand B. at hand C. for hand D. by hand
A. to, in B. at, in C. for, at D. of, in
A. improve the environment
B. to improve the environment
C. improving the environment
D. improved the environment
A. how long can I keep the books B. how long I can keep the books
C. when should I return the books D. when I should return the books
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