-----Where ____ you put the ruler? I can't see it anywhere.
-----I put it right here. But now it is ____.
| A．have, gone | B．did, missed | C．had ,going | D．will, missing |
If you ________ home without a word, your parents wouldn't be so worried now.
| A．didn't leave | B．couldn't have left |
| C．hadn't left | D．shouldn't leave |
We ________ here on time but we were caught in a traffic jam.
| A．must have arrived | B．could have arrived |
| C．need have arrived | D．should have arrived |
—Can you keep a secret?
—You ________ worry—I'm not going to mention it to anyone.
| A．needn't | B．couldn't |
| C．mustn't | D．won't |
For those of you who ________ a few very popular articles that came out last week, check out this mail.
| A．may miss | B．must have missed |
| C．may have missed | D．would have missed |
Time ________ heal a broken heart. After five years, Steve seems to have got over the sorrow of losing his son.
| A．should | B．would |
| C．shall | D．can |