If the earth suddenly ............ spinning, we all would fall off it., stopped, stops, If you hear the phone ringing, why ............. answer it?, you don't, don't you, I don't want to buy an elephant. But where would you go if you ............. to buy one?, want, wanted, I would be very grateful if you kindly ............. this document as soon as possible., sign, signed, If I ........... a tiger walking across Hyde Park, I would probably climb up a tree., see, saw, If somebody ........... my doorbell at 3 a.m., I would be very unwilling to open the door., rings, rang, If you ............ a cat, the mice will not run about everywhere., keep, will keep, If you ........... a university degree, you can sit in a comfortable office., had, have, If he didn't ........... hours watching TV, he would have time to do odd jobs in the house., spent, spend, They would probably work better if he ............. his staff properly., pays, paid.

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