13.Through long power lines electricity goes ______.
A. to the place needed B. there it is needed C. where it is needed D.which is it needed
14. ______ from the apple tree.
A. It down fellB. there it is needed C. Down fell itD. Fell it down
15.The service in this restaurant is very poor; there are not enough waiters to wait ______ customers.
A. on B. for C. with D. to
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