A computer is so useful a machine ________ we can use everywhere.
| A．that | B．which | C．as | D．what |
One possibility is that tears get rid of certain chemicals from your body _____ build up during stress.
| A．to which | B．that |
| C．where | D．in which |
No, I’m too busy right now. Please give me an hour, _____?
| A．do you | B．don’t you | C．am I | D．OK |
Only after her mother came to help her for the first few months _____ to begin her propjet.
| A．was she allowed | B．she was allowed |
| C．did she permit | D．she permitted |
I didn’t know that he was a cheat, or else I ________________ him.
| A．should have believed | B．shouldn’t believe |
| C．wouldn’t have believed | D．couldn’t believe |
Investment by Chinese companies in the US _____ rapidly in recent years.
| A．was growing | B．has been growing |
| C．had grown | D．will be growing |