They were surprised that a child could work out the problem ______ they themselves couldn’t.
| A．once | B．while | C．then | D．If |
Two men ___ into my flat. One of them threatened me with a knife while the other tied me up.
| A．found their way | B．pushed their way |
| C．wound their way | D．made their way |
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 |