The girl in plain clothes, was wonderfully calm in face of danger, was just sixteen years old.
| A．when | B．which | C．what | D．who |
This cake is very sweet. You ______ a lot of sugar in it.
| A．should put | B．could have put | C．might put | D．must have put |
—Catherine, I have cleaned the room for you.
—Thanks. You _____it. I could manage it myself.
| A．needn’t do | B．needn’t have done |
| C．mustn’t do | D．shouldn’t have done |
He paid for a seat, when he _____ have entered free.
| A．could | B．would | C．must | D．need |
—Do you know where David is? I couldn’t find him anywhere.
—Well. He _____have gone far—his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
If the new arrangement doesn’t _____, we’ll go back to the old one.
| A．work over | B．work out | C．work up | D．work down |