11. The leader teaches us how to build fires.
12. It is very important to brush your teeth twice a day.
13. We have to wear a school uniform at my school.
14. My uncle grows tomatoes in a greenhouse.
15. I help my little brother to go on every morning.
16. They often go camping at weekends.
17. Rock music is not really my thing.
Ответ: 11. build, 12. brush, 13. uniform, 14. greenhouse, 15. go, 16. go, 17. thing