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-What's up? You look worried.
Well,I_____on the problem for 5 hours but I haven't got a single clue.

A．have worked	B．worked
C．will work	D．have been working

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A ship in harbor is safe, but that’s not ______ ships are built for.

A．what

B．whom

C．why

D．when

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Just as I got to the school gate, I realised I ______ my bank in the cafe.

A．have left	B．had left
C．would leave	D．was leaving

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Only when Lily walked into the office ______ that she had left the contract at home.

A．she realized	B．has she realized
C．she has realized	D．did she realize

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The quality of education in this small school is better than ______ in some larger schools.

A．that	B．one
C．it	D．this

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—Sorry, Liz. I think I was a bit rude to you.
—______, but don’t do that again!

A．Go ahead	B．Forget it
C．It depends	D．With pleasure

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