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1. I spent some time              (have) sports every day. I think it's a good way to keep healthy.
2. — How far is it from our school to the farm?
    — It is about two              (hour) walk.
3. As a student, we should listen to our teachers _______ (care) in class.
4. — Where are the twins?
    — They have             (go) to the library. They want to borrow some books.
5. Everyone knows that the harder we study, the _______ (much) knowledge we can get.
6. Mrs. Mort invented a memory robot to make it _______ (work) for her husband because he had a very
    bad memory.
7. They were              (watch) TV at home when their mother came back last night.
8. Wang Nan plays ping-pong very well. She is one of the most famous _______ (play) in the world.
9. — Mum, there's a waste bag on the ground.
    — Oh, dear! It shouldn't be              (throw) out. Please pick it up and put it into the dustbin.
10. It was cold yesterday. My mother came to the school and _______ (bring) me some clothes.

A. How far
B. How often
C. How long
D. How much