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—When ______ this kind of computer ______ —Last year. (design)

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If there ______ (be) no air, people would die.

The teacher told us that tomorrow December 25 ______ (be) Christmas Day.

The average lifespan for these men ______ (should be) 68 years, if they’d aged twice as fast during their years in office as the popular wisdom suggests they do.

Recent research suggests the use of the Internet for political information ______ (increase) the probability of participation.

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