13. Every few hundred meters along the wall there are watch-towers, where

　　 soldiers used to keep _____.

Answers:　

12. He walked so fast that I could hardly keep _____　 _____　 him.

11. The good news keeps our　 spirits _____.

10. I see you are getting along well with your English studies.　 Keep _____ the

　　　 good work.

9. The rain kept _____ all night.

8. It is also bad manners to keep _____ when the teacher asks you a question.

7. Will this overcoat keep the rain _____?

6. Danger!　 Keep ______!

5. You may depend _____　 his doing what he says, for he is a person who always

　　 keeps _____　　 _____.

4. He kept _____ telling us the same story over and over.