Scientists have many theories about how the universe ____ into being.    

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• 1After Jack had sent some e-mails, he _______ working on his project.

  A.had started

  B.has started

  C.started

  D.starts

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• 2— Hello, I ____ you ____ in London, how long have you been here?  — I came here last week.

  A.don't know; were

  B.didn't know; were

  C.haven't known; are

  D.hadn't known; are

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• 3So addicted to computers ____ that the leaders in the summer camps often had to force them to break for sports.

  A.the children did become

  B.did the children become

  C.the children became

  D.became the children

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• 4— I telephoned him twice and I couldn't get through to him. — I think that the line might have been out of order, ____  ?  

  A.don't you

  B.wasn't it

  C.do you

  D.hadn't it

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• 5— When do you think _____ he_____ the dictionary?— Sorry. I have no ide

  A.A.had; bought

  B.has; bought

  C./; bought

  D.did; buy

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• 6— You seem to be familiar with this city!— I _______ English in a high school here for three years. It' s great to be back!

  A.have taught

  B.have been teaching

  C.had taught

  D.taught

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• 7The other day I ________ an interesting film with my friends.

  A.saw

  B.hadseen

  C.see

  D.amseeing

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• 8— I can't find my cell phone in my bag.—     it at home.

  A.Have you left

  B.Did you leave

  C.Had you left

  D.Do you leave

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• 9Not until his father died ____ what his father really meant.

  A.do they realize

  B.did they realize

  C.realized they

  D.had they realized

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• 10It being Sunday, I ______ up early this morning, so I stayed in bed until 9 am.

  A.didn't need to get

  B.couldn't have gotten

  C.needn't have gotten

  D.mustn't have gotten

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