Since the road is wet this morning, _____ last night.
| A．itmustrain | B．itmusthaverained |
| C．itmustberained | D．itmusthavebeenrained |
The experiment is______failure．But do remember that，in the face of failure，you should still keep up good state of mind．
| A．/；the；the | B．a；/；the | C．the；/；the | D．a；/；a |
---Don’t press the button , John.
---What if I ______?
| A．did | B．would | C．will | D．shall |
As a mother, I seldom give my children so difficult a job _____they can’t do actively.
| A．that | B．as | C．which | D．what |
---Jackson was late for Mr. Black’s literature class this morning.
---_____? As far as I know, he never came late to class.
| A．So what | B．Why not | C．How come | D．What for |
The students have been told that under no condition ______ the mobile phone in class.
| A．may they use | B．they may use | C．they could use | D．would they use |