We laugh at jokes, but seldom __________ about how they work.
| A．we think | B．think we | C．we do think | D．do we think |
If you smoke, please go outside.
| A．can |
| B．should |
| C．must |
| D．may |
On arriving at the station, we ourselves into several groups to help the cleaners gather the rubbish thrown by the passengers.
| A．separated |
| B．divided |
| C．formed |
| D．broke |
_____, the pay isn't attractive enough, though the job itself is quite interesting.
| A．Generally speaking |
| B．On the contrary |
| C．In particular |
| D．To be honest |
This used to be a very pretty valley and attracted many visitors.
| A．at a time |
| B．at no time |
| C．at one time |
| D．from time to time |
I have been convinced that the print media are usually more and more reliable than television.
| A．accurate |
| B．ridiculous |
| C．urgent |
| D．shallow |