While watching television，____．
| A．the doorbell rang | B．the doorbell rings |
| C．we heard the doorbell ring | D．we heard the doorbell rings |
—I don’t care what people think.
—Well, you _______
| A．could | B．would | C．should | D．might |
What do you mean, there are only ten tickets? Therebe twelve.
| A．should | B．would | C．will | D．shall |
— It’s the office! So you know eating is not allowed here.
— Oh, sorry.
| A．must | B．will | C．may | D．need |
I’m afraid Mr. Harding_________see you now. He’s busy.
| A．can’t | B．mustn’t | C．shouldn’t | D．needn’t |
The exhibition is open to all-comers able to the entrance tiekets.
| A．manage | B．make | C．sell | D．send |