(2006·山东)

--- May I smoke here?

--- If you ________, choose a seat in the smoking section.

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(2007·江西)

--- Where is my dictionary? I remember I put it here yesterday.

--- You ________ it in the wrong place.

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(2007·上海)

The traditional view is ________ we sleep because our brain is "programmed" to make us do so.

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(2006·上海)

Black holes ________ not be seen directly, so determining the number of them is a tough task.

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(2006·江苏)

--- I think I'll give Bob a ring.

--- You ________. You haven't been in touch with him for ages.

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(2007·湖南)

Cathy is taking notes of the grammatical rules in class at Sunshine School, where she ________ English for a year.

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(2007·浙江)

--- My cat's really fat.

--- You ________ have given her so much food.

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(2007·上海)

--- Guess what? I have got A for my term paper.

--- Great! You ________ read widely and put a lot of work into it.

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(2006·天津)

We ________ have proved great adventurers, but we have done the greatest march ever made in the past ten years.

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(2005·湖北)

--- Do you know where David is? I couldn't find him anywhere.

--- Well. He ________ have gone far---his coat's still here.

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