16. You _____ return the book now. You can keep it till next week if you like.
| A．can’t | B．mustn’t | C．needn’t | D．may not |
Don’t call me tomorrow evening, for I ____________to a lecture on how to keep a good state of mind when taking an exam.
| A．will listen | B．should listen | C．shall listen | D．will be listening |
rise in carbon dioxide is causingsteady increase in global warming.
| A．不填; a | B．The; a | C．The;不填 | D．A；the |
–Would it bother you if I asked for your opinion on this report?
--______.
| A．No, I don’t | B．Yes, go ahead | C．Not at all | D．With pleasure |
–When has the country been united as one?
--______1998, I suppose.
| A．In | B．From | C．After | D．Since |
–Daddy, I’m anxious about the coming exam.
--Come on, boy. You’ve got to have confidence in yourself _____ you will make it.
| A．when | B．which | C．that | D．how |