11. Mark isn't old enough to ride his bike to school.
12. Nga is interested in listening to traditional stories.
13. Bao suggests meeting at cafe corner.
14. Miss Jackson asked Tim to try his best to improve his pronunciation.
15. I learn English so as to communicate with foreigners.
16. My father told me not to make so much noise.
17. They teach Maths well.
18. He is an active participant in outdoor activities.
19. We are going to join in an English club.
20. It is such a difficult word that we can't spell it.