用must，have to，should，may，can，shall的正確形式填空。

(1)You ought to buy some books,prices ______ go up in these days.

(2)This old woman ______ be used to living without a car,isn't she?

(3)My sister ______ wait outside because she left her key in the office.

(4)—What ______ it be?

—It can't be a desk,for it is moving,It must be a car.

(5)—Is John coming by train?

—He ______,but he may not.He likes driving his car.

(6)It is cold in the room. ______ Tom close the door to keep the cold out?
答案：
解析：

 (1)may　(2)must　(3)had to　(4)can　(5)should　(6)Shall


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