23. I don't really care           (我的朋友和我相同还是不同) .(if)

22. —Would you mind helping me           (把餐桌上的牛奶擦掉) ？

—Of course not. (clean)

21. I'm shy                (所以对我来说交朋友不容易) .(easy)

20. —Which one is your sister?

—            (穿红衣服的那个) .(one)

19. Tom             (从不去看牙医清洁牙齿) .(for)

18.                (关于看电视的问题的答案) were also interesting.（about)

17. Last month we               (问了我们的学生关于他们空闲时间的活动) .(ask)

16. We          (等了一个多小时) because there were too many people. (wait)

15. We                 (又走了两个小时) before we got to the top. (another)

14. The only problem was                 (在晚上除了阅读没有很多可做的事) .(but)