He said that he had left his umbrella in the library.

He said that he had left his umbrella in the library.

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He is always very active in student activities.

He is always very active in student activities.

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He is always making excuses for being late.

He is always making excuses for being late.

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In the United States a lot of college students do not live at home.

In the United States a lot of college students do not live at home.

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It is certain that we shall produce this kind of engine.

It is certain that we shall produce this kind of engine.

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