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1、[单选题]The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.
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A.cause
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B.being caused
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C.to be caused
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D.to have caused
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2、[单选题]I don’t know whether you happen ________ , but I’m going to study in the U. S.
this September.
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A.to be heard
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B.to be hearing
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C.to hear
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D.to have heard
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3、[单选题]You were silly not ________ your car.
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A.to lock
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B.to have locked
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C.locking
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D.having locked
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4、[单选题]The managers discussed the plan that they would like to see ________ the next year.
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A.carried out
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B.carrying out
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C.carry out
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D.to carry out
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5、[单选题]The research is so designed that once ________ nothing can be done to change it.
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A.begins
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B.having begun
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C.beginning
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D.begun
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6、[单选题]________ by the beauty of nature, the girl from London decided to stay another two days off the farm.
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A.Attracting
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B.Attracted
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C.To be attracted
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D.Having attracted
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7、[单选题]According to a recent U. S. survey, children spend up to 25 hours a week ________ TV.
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A.to watch
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B.to watching
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C.watching
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D.watch
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8、[单选题]Sarah, hurry up. I’m afraid you can’t have time to ________ before the party.
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A.get changed
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B.get change
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C.get changing
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D.get to change
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9、[单选题]Robert is said ________ abroad, but I don’t know what country he studied in.
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A.to have studied
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B.to study
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C.to be studying
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D.to have been studying
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10、[单选题]The old man, ________ abroad for twenty years, is on the way back to his motherland.
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A.to work
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B.working
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C.to have worked
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D.having worked
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11、[单选题]Linda worked for the Minnesota Manufacturing and Mining pany, ________ as 3M.
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A.knowing
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B.known
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C.being known
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D.to be known
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12、[单选题]If you are planning to spend your money having fun this week, better ________ it—you’ve got some big bills ing.
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A.forget
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B.forgot
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C.forgetting
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D.to forget
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13、[单选题]Having been attacked by terrorists, ________ .
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A.doctors came to their rescue
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B.the tall building collapsed
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C.an emergency measure was taken
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D.warnings were given to tourists
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14、[单选题]The man insisted ________ a taxi for me even though I told him I lived nearby.
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A.find
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B.to find
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C.on finding
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D.in finding
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15、[单选题]________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
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A.To wait
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B.Have waited
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C.Having waited
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D.To have waited
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