Susan turned down her friend’s invitation_______an important meeting.

A. because B. since C. because of D. as

Thank you for_______let me_______on the trip.

A. agree to;go B. agreeing;going C. agreeing to;go D. agree;to go

You should ask Bob ________ his own clothes. He is ten years old now.

A. wash B. washes C. washing D. to wash

--Do you have any plans for this weekend? --I’m not sure.I_______go climbing.

A. must B. need C. may D. can

Goldilocks decided _________ for a walk in the forest.

A. go B. to go C. going D. goes

--Look,the day lady in red_______be our English teacher. --No,she_______be.She is in the office now.

A. must;can’t B. can;mustn’t C. may;mustn’t D. shall;can’t

—Mom, I play the computer game for a while?

—I'm afraid you have to finish your homework first.

A. must B. need C. will D. may

（题文）---You look very pretty, if I say so.

---Thanks a lot for saying that.

A. must B. may C. will D. have to

（题文）—Is Mr Brown driving here?

—I’m not sure. He ______ come by train.

A. may B. shall C. need D. must

—Look, someone left a book.

—Oh, yeah … This book ________be Kitty’s. Only she likes to read this kind of books.

A. can  B. must 

C. may  D. might