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
A. Anything B. Something C. Nothing D. Other things
A. can B. have to
C. should D. need
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