—Must we keep the window open all the time? A. No, you mustn’t B. No, you can’t. C. No, you don’t have to.
We still gave the boy another chance ______he made some mistakes.
You can never imagine the great difficulty I had ______ her QQ number.
Yunmeng Mountain _______lies in the south of Hebi attracts the visitors both at home and abroad.
The boy ______ a piece of waste paper, and put it into the rubbish bag.
Henry speaks Chinese very well. He ______ in China since 2002.