— What do you think of bacteria, _____ good or bad?   — _____ to say, but one thing is certain: without bacteria, the world would be quite different from what it is.    

试卷相关题目

• 1_____ in the queue for half an hour, the old man suddenly realized he had left the cheque in the car.

  A.Waiting

  B.To wait

  C.Having waited

  D.To have waited

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• 2_____ any failures, I have the courage to meet all challenges.

  A.Having experienced

  B.To experience

  C.Experienced

  D.Experience

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• 3 _____   to reach them on the phone,we sent an e-mail instead.   

  A.Fail

  B.Failed

  C.To fail

  D.Having failed

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• 4_____ the child to bed, she began to correct the pupil's exercise.

  A.Sending

  B.Being sent

  C.Having sent

  D.Sent

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• 5Although _____ considerable success as an artist, the young man keeps working hard.

  A.achieving

  B.achieved

  C.to achieve

  D.having achieved

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• 6_____ a reply from Mabel, Jack sent another e-mail to her.

  A.Not receiving

  B.Having not received

  C.Not received

  D.Not having received

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• 7_____ on the subject for half an hour, Liu Ying suddenly stopped.

  A.To be worked

  B.To work

  C.Having worked

  D.Having been worked

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• 8All the task _______ ahead of time, they decided to go on holiday for a week.

  A.had been finished

  B.were finished

  C.having been finished

  D.been finished

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• 9____ for months, the room is very dirty.

  A.We don't clean it

  B.Having not cleaned

  C.Not having been cleaned

  D.Having not been cleaned

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• 10The noise from the top floor, loud and constant, of the meeting-room _______ can be clearly heard in our classroom.

  A.being decorated

  B.having been decorated

  C.to be decorated

  D.decorated

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