So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.
| A．he has felt | B．has he felt | C．he did feel | D．did he feel |
There’s no light on — they __________ be at home.
| A．can’t | B．mustn’t |
| C．needn’t | D．shouldn’t |
— Could I have a word with you, mum?
— Oh dear, if you __________.
| A．can | B．must |
| C．may | D．should |
—Is Jack on duty today?
—It __________ be him. It’s his turn tomorrow.
| A．mustn’t | B．won’t |
| C．can’t | D．needn’t |
As you worked late yesterday, you __________ have come this morning.
| A．mayn’t | B．can’t |
| C．mustn’t | D．needn’t |
— Must he come to sign this paper himself?
— Yes, he __________.
| A．need | B．must |
| C．may | D．will |