It was not until the teacher had explained it three times _______ how to work out the problem.
| A．did he understand | B．had he understood |
| C．that he understood | D．that he didn’t understood |
—Dick has a bad cough because of smoking.
—Why doesn’t he ？
| A．give it up | B．give it in | C．give it out | D．give it away |
it is to jump into a pool or go swimming in a river in summer!
| A．What great fun | B．What a great fun |
| C．How great fun | D．How a great fun |
Mobile phones have made possible for us to reach out to the farthest corners of the world from our homes.
| A．them | B．that | C．this | D．it |
－Do you have sweet tooth?
－Yes, but I’m on diet now.
| A．a;the | B．不填；a | C．不填；不填 | D．a; a |
．—Shall we have red wine or white?
—Either is OK.
| A．It’s up to you. | B．That’s settled. | C．Go ahead. | D．You’ve got it? |