College graduates are offered lots of available jobs, ______, I believe, they can fully demonstrate their knowledge and competence.
| A．where | B．which | C．that | D．what |
The earth became so violent that it was not clear_________ the shape would last or not.
| A．if | B．how | C．whether | D．why |
__________ she couldn’t understand was _________ fewer and fewer students showed interest in her lessons.
| A．What; why | B．That; what | C．What; because | D．Why; that |
The clever boy made a hole in the wall, ________ he could see what was going on inside the building.
| A．on which | B．at which | C．through which | D．in which |
—What sort of house do you want to have? Something big?
—Well, it _______ be big—that’s not important. But it _________ have a nice garden—that’s important for me.
| A．mustn’t; need | B．needn’t; must |
| C．couldn’t; need | D．shouldn’t; must |
—The windows are dirty.
—I know. They _________ for weeks.
| A．haven’t cleaned | B．didn’t clean |
| C．weren’t cleaned | D．haven’t been cleaned |