You’d better keep the classroom _____.
A. cleaning B. cleaned C. clean
Nowadays _______ of business letters ______ in English.
A two third, writes B. two thirds, is written C. two thirds, are written
---Excuse me, could you tell me _______?
---Sorry, sir. I wasn't there at that time.
A. how did the accident happen
B. how the accident happened
C. how does the accident happen
He's read this book before, ______?
A. hasn't he B. doesn't he C. isn't he
We have two houses but _______ of them lies in Quanzhou. It's impossible to live in.
A. neither B. all C. none
---Don't make any noise in the library.
---_______.
A .OK, I will B. Yes, I do C .Sorry, I won't