Let’s put off the picnic until next week, _____ the weather may be better.
| A．then | B．if |
| C．as | D．when |
—Did you telephone the manager’s office?
—Yes，he__________back before 9 o’clock this morning.
| A．expects | B．is expected | C．expected | D．was expected |
You can certainly leave the classroom as soon as your homework__________.
| A．has done |
| B．has been done |
| C．will be done |
| D．will have been done |
—Do you smoke?
—No，I don’t.It’s two years since I __________.
| A．smoked |
| B．have smoked |
| C．has smoked |
| D．don’t smoke |
—How is the boy?
—Sorry.He__________though the doctor made every effort to save him.
| A．died | B．was dead | C．had died | D．has been dead |
I should very much like to have gone to that party of theirs，but__________.
| A．I’m not invited |
| B．I have not been invited |
| C．I was not invited |
| D．I had not been invited |