16. Thirty divided by six is five.

15. I decided to work harder.

14. The clerk agreed to conclude the meeting then.

13. The teacher was very concerned for the children's safety.

12. The poor baby caught a cold a week a ago and he is still ill now.

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11.`They considered the last question briefly.

10.Lily is a cheerful girl.

9.Work hard, and you can keep up with your classmates.

8. My brother is busy doing his homework now.

7. This book belongs to them.