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Question 22. It's really difficult to___________ a bicycle up the hill.

A. pedal                                   B. drive                C. fly                    D. walk

Question 23. It takes me two hours ____________that letter.

A. to write                      B. write                C. writing             D. for writing

Question 24. In order to save energy, don’t forget to __________ the lights before you leave.

A. turn                           B. turn on             C. turn off            D. turn of