5.(2018呼和浩特)—Where are you going this month?

　　—We________ go to Xiamen,but we're not sure.

　　A. needn't B. might C. must D. mustn't

　　6.(2018自贡)—Whose bike is this?

　　—I am not sure. It ________ be Mary's.

　　A. shall B. must 　C. might

　　7.(2018青岛)The girl in the classroom ________ be Sarah. She has gone to the library.

　　A. may B. must C. can't D. needn't

　　8.(2018常德)—Is Tom coming by train?

　　—He________ drive his car,I'm not sure.

　　A. can't B. may　C. must

　　9.(2018岳阳)The sweater________ belong to Jim. It's much too large for him.

　　A. mustn't B. can't 　C. needn't

　　10.(2018甘肃通用卷)—Excuse me,is this the right way to the Children's Palace?

　　—Sorry, I'm not sure. But it________ be.

　　A. mustn't B. might C. can't D. must

　　11.(2018泉州)—What's wrong with Judy? She has been absent for two days.

　　—Oh, she________ be ill. Let's go to ask Mr. Green.

　　A. may B. need　C. would

　　12.(2018咸宁)—Do you think that Kobe will be elected as the MVP this year?

　　—It ________ him. He has retired(退役)since April 13.

　　A. can't be B. mustn't be

　　C. must be D. can be