Lin Tao has returned from the UK recently. He ______ at Cambridge for four years, during which we ______ with each other on the Internet.
| A．has studied; has communicated | B．had studied; communicated |
| C．studied; had communicated | D．studied; communicated |
I ______________ have passed my examination easily，but I made too many stupid mistakes．
| A．must | B．will | C．shall | D．could |
Mom，don’t you think it's OK to play once in a while ____________ it doesn’t affect my studies?
| A．even if | B．unless |
| C．so that | D．as long as |
— Is everyone here?
— Not yet．Look，there ______________ the rest of our guests!
| A．come | B．comes |
| C．is coming | D．are coming |
The boy was so tired that he fell asleep _____________ his mother could take off his clothes．
| A．before | B．after | C．while | D．where |
—Why not find a new job?
—Why should I? I _____________ as much，but I like what I'm doing．
| A．didn't earn | B．don't earn |
| C．hadn't earned | D．haven’t earned |