________ there is no restriction on foreign entries at the film festival ，those that win are in minority.
A. unless B. When C Where D while
________ seems to be a strong competition in China for senior high students to enter college or university.
A. It B. This C. That D. There
It is no use _________ to persuade him ________ smoking because he has been addicted to it since he was young.
A. trying, to quit B. to try, to quit C. to try, quit D. trying, quit
I would have come earlier, but I ________ that you were waiting for me.
A. hadn’t known B. didn’t know C. would have known D. haven’t know
five hours to the meeting, David learnt that it had been postponed.
A. Having driven B. Driven C. Being driven D. To be driven
After the new technique was introduced，the factory produced ________ tractors in 1988 as the year before.
A. as twice many B. as many twice C. twice as many D. twice many as
