He has worked out exactly what his income will have to be during the first six months to _____ his costs.
| A．spare | B．cover | C．save | D．spend |
John ___ be a basketball player.He’s much too short.
| A．may | B．mustn’t | C．can't | D．should |
See who’s there! ____ it be Mary?
| A．May | B．Must | C．Can | D．Will |
“Can I take it away?” “You ___ better not.”
| A．should | B．could | C．would | D．had |
“Let’s go to the library, shall we?” “____”
| A．NO, I can't | B．Yes, I will | C．Yes, thank you | D．NO, we’d better not |
“Do you have to leave now? ” “I’m sorry, but I really ____.”
A. can’t B,have C.should D.must