______ I always felt I would pass the exam, I never thought I would get an A.
A. While B. Unless C. If D. Until
—Sorry, Ann. I’m afraid that I can’t go to the magic show by David Copper Field with you.
— _____ Who knows when he will be back here again?
| A．It doesn’t matter. | B．Do as you like. |
| C．What a shame! | D．Take it easy. |
—I’d like a pen which _________ well.
—Will this one _________?
| A．is written；work | B．writes; work | C．is written; do | D．writes; do |
However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects.
| A．troubled | B．disturbed | C．confused | D．puzzled |
The visitors here are greatly impressed by the fact that_______ people from all walks of life are working hard for_____ new Binhai.
| A．不填; a | B．不填;the | C．the; a | D．the; the |
It was required that the tall building _______ at present because it is still new.
| A．not pulled down | B．was not pulled down |
| C．not being pulled down | D．not be pulled down |