28. You should pick up the rubbish and throw it into a d_____

27. Don't draw pictures on p_____ walls.

26. A 12-year-old boy named Li Lida successfully went a ______the Qiongzhou Channel.

25. Yesterday I took part in the b ______ 100-metre race.

24. My teacher often e______ us to speak English.

23. The road was so n_____ that the truck couldn't pass.

22. It is n ______ eight you must hurry or you'll miss the train.

21. Qingdao is one of the best places for s______ in China.

20. Good news!　 We have w _____ the relay race.

19. Go along this road until you r _____ the end.