The classroom is so dirty. _________ we clean it?
| A．shall | B．Will | C．Would | D．Do |
On his way home yesterday , Tom was hit on the head_____he had time to realize what was happening .
| A．since | B．before | C．when | D．until |
While the ship was sinking very fast , the captain didn’t want to_____the ship .
| A．escape | B．abandon | C．resist | D．prevent |
Most of the developing countries are faced with lots of troubles , _____the financial problem is not the worst .
| A．which | B．with which | C．that | D．of which |
It was the second time that I_______of the changes of the timetable .
| A．have been informed | B．had been informed |
| C．have informed | D．had informed |
I think it quite foolish of you_______into buying such products as that .
| A．to persuade | B．persuading | C．to be persuaded | D．being persuaded |