Living things are dying out quickly. Let’s ask ____ destroying them in the past years.
| A．what part people have been playing |
| B．people have played in |
| C．what part people have played in |
| D．people have been playing what part |
I will stay at home to play chess on the computer _____ it snows tomorrow.
| A．if | B．unless | C．before | D．after |
The wounded ____ as well stay at home on such a terrible day.
| A．can | B．must | C．may | D．should |
______ in the novel, I didn’t notice what was happening.
| A．Buried | B．having buried |
| C．Burying | D．To be buried |
I am sorry that I can not meet you at the railway station. I _______ Beijing by the time you come back from abroad.
| A．have left | B．will have left |
| C．will leave | D． am leaving |
The thief looked around every now and then _____ he knew he was being followed.
| A．even if | B．in case | C．so that | D．as if |