Everyone passed the exam.It _________ difficult.
| A．can’t have been | B．must have been | C．couldn’t be | D．might have been |
He _______ cards with his friends, but now he _______ a walk after supper.
| A．used to play; is used to having | B．is used to playing, used to have |
| C．used to play; is used to have | D．is used to playing; is used to have |
Instead of sending e-mail, Nancy talks with her mother on mobile phone once a week.
| A．the; a | B．an; the | C．an; / | D．the; an |
— Sorry, Sir. I didn’t quite follow you.
— ______. I’ll explain it to you later.
| A．Don’t mention it | B．Come on | C．That’s right | D．Don’t worry |
When you’ve finished school, don’t forget to come back to visit your school, ______?
| A．will you | B．do you | C．have you | D．won’t you |
Humans are destroying nature day by day, ________, of course, will cause punishment sooner or later.
| A．that | B．/ | C．which | D．What |