A. hold on to B. look up to
C. pay attention to D. look forward to
A. Who was it invented by B. When was it invented
C. What is it used for D. Where was it bought
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
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