I was on the highway when this car went past fol. Lowed by a police car. They ______ at least 150 kilometers an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
---Excuse me, do you have the time? ---_______.
| A．Yes; I do | B．Of course, I have | C．A quarter to ten | D．No problem |
_______ is known to the world, the Chinese in many places _______ the old tradition.
| A．That; keep on | B．which; keep out | C．It ; keep back | D．As; keep up |
Have you any idea _______?
| A．that how we can improve the English level within 4 months |
| B．that how can we improve the English level within 4 months |
| C．how can we improve the English level within 4 months |
| D．how we can improve the English level within 4 months |
The question came up at the meeting _______ we had enough money to change the environment
| A．that | B．what | C．whether | D．which |
--- Believe me, all your efforts will _______ some day. --- Thanks for your encouragement.
| A．pay back | B．pay down | C．pay off | D．pay for |