---Why do you look so upset?
---There are so many troublesome problems _____.
| A．remaining to be settled | B．remained settled |
| C．remaining to settle | D．remained to be settled |
When I lived with my roommates in the university, we ________ often talk into the night.
| A．might | B．could |
| C．should | D．would |
________ your letter, I would have set off two days ago.
| A．If I could have received |
| B．Should I receive |
| C．If I received |
| D．Had I received |
You ________ in person; a telephone would have been enough.
| A．couldn't have come | B．needn't have come |
| C．shouldn't have come | D．mustn't have come |
I felt surprised that anyone of his intelligence ________ such an easy test.
| A．might have failed | B．could have failed |
| C．should have failed | D．must have failed |
________ from the bright smile on his face, he ________ in passing the job interview.
| A．Judging; must have succeeded |
| B．Judging; might succeed |
| C．Judged; must have succeeded |
| D．Judged, might succeed |