The little child ________ go out alone at night, so he ________ walk in the dark that night.

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• 1 I really don't know how to thank you, but for your help, I ________ my lost necklace.

  A.couldn't have found

  B.mustn't have found

  C.couldn't find

  D.wouldn't find

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• 2Attention, please. All of you students _______ remain in their seats until all the papers have been collected.

  A.can

  B.will

  C.may

  D.shall

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• 3Five minutes earlier, and we______the last bus.

  A.had caught

  B.should have caught

  C.could have caught

  D.caught

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• 4 If we________a table earlier, we couldn't be standing here in a queue.

  A.have booked

  B.booked

  C.book

  D.had booked

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• 5Though it is the first time they have met, they talked as if they _______ friends for many years.

  A.are

  B.were

  C.had been

  D.have been

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• 6--The mistake _____, I had been more careful. ---But you weren't at that time.

  A.might have avoided

  B.would avoid

  C.would be avoided

  D.might have been avoided

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• 7This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.

  A.have reflected

  B.are reflecting

  C.will reflect

  D.reflected

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• 8 —Why are your eyes so red? You ________ have slept well last night. —Yeah, I stayed up late writing a report.

  A.can't

  B.mustn't

  C.needn't

  D.won't

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• 9 —Did Ann fail in English? —She ________.Don't you notice that she looks depressed?

  A.might

  B.must

  C.may have

  D.could have

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• 10I ______ to my cousin 's birthday party last night, but I was not available.

  A.went

  B.had gone

  C.would go

  D.would have gone

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