If I had worked hard at school, I ______ (be) an engineer, too.
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It is strange that he ______ (leave) without a word. It is not like him.
—When ______ this kind of computer ______ —Last year. (design)
If there ______ (be) no air, people would die.
The teacher told us that tomorrow December 25 ______ (be) Christmas Day.
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