It is a long time _______they separated, but it won’t be long ____ they meet again.
| A．since; before | B．after; when | C．since; when | D．after; before |
Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.
| A．should have done | B．would have done |
| C．may have done | D．must have done |
－I went to work on foot yesterday, though it ______ cats and dogs.
－You ______ by bus. It was likely to get a cold.
| A．is raining; must have gone | B．rained; would go |
| C．was raining; should have gone | D．have rained; could have gone |
.－How about paying a visit to Mr. Richardson, our former history teacher?
－Good idea. I will e-mail him today so he ______ know ______ to expect us.
| A．shall; why | B．may; when | C．would; why | D．will; how |
.－We need a person badly to think up such an idea.
－______ the new comer have a try?
| A．Shall | B．May | C．Should | D．Need |
To be on the safe side, we should fill up the tank now, because we ______ run out of gas on the way.
| A．can | B．would | C．might | D．should |