56._________A. prospectiveB. coming C. existingD.

___________! There’s a train coming. A. Look out B. Look around C. Look forward

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—May I open the window to let in some fresh air ？—___________A. Come on B. Take care C.

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56._________A. refersB. concernsC. turnsD. comes

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_________(56)A.came B.comingC.comes D.come

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56._________A.refers B.concerns C.turns D.comes

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Before the guests come I must get the glasses ______.A. washed B. to be washed C. bei

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They always give the vacant seats to ________ comes first. A.whoever B.whomever C.

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