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1、[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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2、[单选题]_______ in thought, he almost ran into the car in front of him.
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A.Losing
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B.Having lost
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C.Lost
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D.To lost
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3、[单选题]Does Liu Hui serve in the army? —No, but he _____in the army for three years.
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A.served
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B.has served
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C.is serving
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D.would serve
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4、[单选题]I feel sure I _____ her before somewhere.
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A.was to meet
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B.have met
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C.had met
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D.would meet
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5、[单选题]Victor apologized for ________ to inform me of the change in the plan.
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A.his being not able
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B.him not to be able
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C.his not being able
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D.him to be not able
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6、[单选题]Paul doesn’t have to be made _______. He always works hard.
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A.learn
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B.to learn
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C.learned
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D.learning
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7、[单选题]How is the weather in your country this summer? —It _____as much as it does now for a long time.
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A.hasn’t rained
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B.doesn’t rain
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C.wasn’t raining
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D.didn’t rain
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8、[单选题]I _____ your last point — could you say it again?
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A.didn’t quite catch
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B.don’t quite catch
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C.hadn’t quite caught
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D.can’t quite catch
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9、[单选题]Having a trip abroad is certainly good for the old couple, but it remains _______ whether they will enjoy it.
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A.to see
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B.to be seen
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C.seeing
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D.seen
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10、[单选题]The boy wanted to ride his bicycle in the street, but his mother told him _______.
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A.not to
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B.not to do
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C.not do it
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D.do not do
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11、[单选题]Don’t put the waste on the ground. —Oh, I’m very sorry. I _____the dustbin there.
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A.don’t see
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B.isn’t seeing
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C.didn’t see
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D.haven’t see
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12、[单选题]New medicines and instruments ______ every day to extend life.
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A.develop
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B.are being developed
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C.are developing
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D.have developed
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13、[单选题]The pilot asked all the passengers on board to remain ________ as the plane was making a landing.
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A.seat
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B.seating
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C.seated
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D.to be seating
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14、[单选题]_______ such heavy pollution already, it may now be too late to clean up the river.
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A.Having suffered
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B.Suffering
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C.To suffer
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D.Suffered
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15、[单选题]We agreed _______ here but so far she hasn’t turned up yet.
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A.having met
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B.meeting
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C.to meet
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D.to have met
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