— is the number of the students in your school, Wu Dong?—It’s more than 1,000, but I’m not sure about it.
Mary had few close friends. So she didn’t know ________ about the problems.
---It’s a long time we last met. How is everything going?---Well, I am living a happy life.
--- _________ has he taught in the school?---Since he left the college.
--- Must I return the book this week?--- No, you ____________. You can ____________ it for 20 days.
Look! __________ high speed the car is __________! It’s so dangerous.