I think humour is a vital form of entertainment, ____ it makes us laugh and laughing keeps us healthy.
A. when B. after C. if D.because
The UN is an important international organization _____helps many people around the world.
A. who B. that C. where D. /
When you get on stage for the first time, you may be surprised by ______bright the lights are.
A. what B. so C. how D. too
If you had joined the chat room ten minutes ago, you ______what we were talking about!
A. have known B. knew C. would have known D. would know
Yesterday, when I went to his office, he ______ online for some information. I think it will be an interesting lecture.
A. searched B. was searching C. would search D. has searched
Instead of telling the joke he _______, Crystal made up a new one.
A. made B. has made C. had made D. would make
