20. The teacher is popular with the students because he _______ ______ ______ ______ (对他们要求严格).

19. ______ _______ ________ (除…之外) Wang Hai, who will go there?

18. We ______ _______ (下决心) that this should never be allowed to happen again.

17. She ______ _______ _______ (全神贯注于) reading, so she didn’t notice what was happening.

16. He suggested that the machine ________ ________ (检查) carefully before we used it.

15. A: The movements of the other planets in the sky made sense only if you put the sun there.

　 B: Only if you put the sun there _______the movements of the other planets in the sky _______ sense.

C. 完成句子

14. A: How will you deal with these letters?

B: What will you _____ _______these letters?

13. A: We will begin the work immediately.

　 B: We will begin the work ______ _______.

12. A: He determined to find out why.

　 B: He __________ his __________ to find out why.

11. A: From the facts John Snow concluded that polluted water carried the disease.

　 B: From the facts John Snow ________ _______ _______ that polluted water carried the disease.