______I always felt I would pass the exam, I never thought I would get an A. A. Once B. While C. If D. Until
Stephen Hawking believes that the earth is unlikelyto be the only planet __________ life has developedgradually.
The newly-built cafe, the walls of __________ arepainted light green, is really a peaceful place for us, especially after hard work.
I have reached a point in my life __________ I am sup-posed to make decisions of my own.
Everyone has periods in their lives __________ everything seems very hard.
Gun control is a subject __________ Americans haveargued for a long time.