Someone is ringing the doorbell. Go and see ____.
| A．who is he | B．who he is |
| C．who is it | D．who it is |
Jimmy needs to improve his technique if he _______ gold at the 2012 Olympics.
| A．wins | B．is winning | C．will win | D．is to win |
Everybody’s fingerprints are _______, so the police can easily find the thieves if any is left when they’re stealing.
| A．single | B．particular | C．special | D．unique |
Knowing how long the test would last, the students who finished _______ back and waited until the end of the exam.
| A．settle | B．settled | C．settling | D．to settle |
I thought things would get better, but _______ it is they are getting worse.
| A．before | B．because | C．as | D．after |
The dull wetland _______ the moment the first ray of sunlight shines on it. Thousands of creatures living in it wake up and begin their life of a new day.
| A．stays alive | B．begins to live | C．makes a living | D．comes to life |