We forbid _____________here. Who permits you_____________？
A. smoking; smoking B. smoking; to smoke
C. to smoke; to smoke D. to smoke; smoking
It’s quite impossible that it will rain tomorrow. But if it _______, I would still go to the park.
A. should rain B. would rain C. rains D. had rained
_____ scores of times, but he still couldn’t understand it.
A. Having explained B. Having been explained
C. Though it was explained D. It was explained
--- He was nearly killed by a car once.
--- Oh. when was________ exactly?
--- It was in 2002 __________ he was riding a bike on the drive-way.
A. this; that B. that; when C. that; that D. this; when
The students expect there ______ more reviewing classes before the final exam.
A. is B. to be C. being D. have been
______ the secret of nature, the young scientist has little time for entertainment．
A. Devoted to research B. Devoted himself to research
C. Devoted to researching D. Devoting to research
