_____I always felt I would pass the exam, I never thought I would get an A.
A.While    B.Once   C. If    D. Until

Your work would be much better _____ you’re always in such a hurry.

On June 16, 2012, it arrested the world’s attention ______ Shenzhou 9 spacecraft was successfully sent into the sky with the first Chinese woman astronaut.

Please don’t try to back out _____ everything has been arranged.

Having cycled for two days, Howard at last arrived at ______ was a place famous for its beautiful scenery.

Disappointed, I was about to leave ____ something occurred, which ____ my attention.

---Did you fall in love with that girl _____ you met her?
---Yes. Now we lead a happy life.

_____ I admit that all these problems are difficult, I don’t agree that they cannot be solved.

He put on a smile and said it didn’t matter，________，in fact，he cared too much about what she said.

At school, some students are active____ some are shy, yet they can be good friends with one another.