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Mr Smith ________ (work) as an engineer in Shanghai since 1992.

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Tom saw his mother ________ (sit) in the sitting room.

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Wei Wei ________ (fall) down while he was running.

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________ (thanks) you very much.

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It's still early. We can walk to school ________ (slow).

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I ________ (not hear) from John since he ________ (go) to college last autumn.

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That young scientist ________ (collect) information every day.

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My father has been to ________ (English) twice.

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There is a big ________ (sit) room at my house.

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The students of Class Two are very ________ (interesting) in the South Pole.