1. I really_____try to get fit.
a. may b. must c. would
2. Whose is this bag? I don't know, but it_____ belong to Sarah
a. can b. should c. may
3._____ I go to the bathroom, please?
a. may b. must c. would
4._____you open the window, please. a. can b. must c. should
5. I'm afraid I_____ play tennis tomorrow. I've got dentist appointment.
a. can't b. couldn't c. would not
6. The test starts at 10:30.You_____be late.
a. don't have to b. mustn't c. can't
7. Children_____do their homework.
a. must c. may
8. You____ borrow my book if you want, Diane
a.may b. can't c.must
9. Customers____request a refund within a period of 30 days.
a.may b. could c. could
10. You_____hand in your homework on Tuesday or you will lose ten percent of your grades
a.can b. must c. could ​