15. The only ______________ (解释)for his behavior is that he’s mad.

14. I don’t care how much I earn. I just want a _________ (挑战性的) job to test my ability.

13. To prevent ______ (使苦恼) your father with an argument, I’m allowing you your freedom.

12. Eat properly and do more exercise, because health c__________ more than anything else in our lifetime.

11. In 2003, SARS caused lots of d___________ to people in China.

10. Exercise r_____________, and you will keep fit and feel great.

9. He is e________________ about making speeches in public.

8．I have no idea of the ___________(平均) size of classes in the UK.

7．The Great Wall was firstly built during the Qin ____________(朝代).

6．Good ________(准备) should be made before we have the important meeting.