11. fly a kite 12. in the middle 13. Spring Festival 14. take a trip 15. collect stamps 16. plant trees 17. worry about 18. listen to music 19. in the gym 20. waste water
1. by bike 2. go to zoo 3. have lunch 4. black and white5. tum left 6. have a cold7. play the piano 8. take photos9.watch TV 10. on foot 11. 故风筝12. 在中间13. 春节 14. 去旅行15. 集邮16. 植树 17. 担心18. 听音乐19. 在体育场 20. 浪费水