---Where is my reference book? It was here a moment ago.---Someone ___ it by mistake.
| A．could have taken | B．must take | C．might take | D．must have taken |
At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions it was too late.
| A．when | B．after | C．until | D．before |
Mr. Smith’s decision to attend ceremony tomorrow can be seen as gesture of his intention to improve the relationship.
| A．the, a, the | B．a, a, the | C．the, the, a | D．a, the, a |
--- Let’s go and have a good drink tonight.
--- Have you got the first prize in the competition?
| A．What for? | B．Thanks a lot. | C．Yes, I’d like to. | D．Why not? |
Don’t be by products promising to make you lose weight quickly.
| A．taken off | B．taken out | C．taken away | D．taken in |
Our friendship our childhood has lasted for years.
| A．dates back to | B．dating back | C．dates from | D．dating from |