20. The teenagers wonder what ______makes Jay a successful pop singer.
| A．is it | B．is it that | C．it is | D．it is that |
—Journalists have to work very quickly in order to ________.
—I know. I like that. It’s very challenging.
| A．earn a high salary | B．meet their deadlines |
| C．avoid being fired | D．make both ends meet |
In Beijing volunteers are making use of every minute to ________ their foreign 
languages because language volunteers must pass a written test and an interview.
| A．polish up | B．take up | C．put up | D．make up |
As is recorded in history, silkworms (蚕) were first raised by a woman in _________ is today Hebei Province.
| A．where | B．the place | C．which | D．what |
Have you heard of it? Firefighters rushed into a burning house, three of them unfortunately _______ in and ________ their lives.
| A．catching; lost | B．caught; lost | C．caught; losing | D．catching; losing |
—Remember how we met the first time, Dick?
—Of course I do. You _________ to the teachers’ office hurriedly and _________ me.
| A．were walking; didn’t notice | B．had walked; weren’t noticing me |
| C．had been walking; noticed | D．walked; had noticed |