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12. Lan cycles skillfully.
13. Their children are very good students.
14. Why don't we go to the cinema?
15. How about visiting the museum this afternoon?
16. What about staying at home and doing our homework?
17. Shall we play football after school?
18. You ought to do exercise regularly.
19. You ought to wash your hands before meals.
20. You ought not to be late for school.
21. You ought to get up early and help your mom.
22. He has to go to work on foot because he doens't have any vehicles.

23. Thanh has to do all these assignments first.
24. They must learn how to keep safe in the water.
25. He must sign his name here.
26. You have to eat a lot of vegetables because it's good for you.
27. They ought to go out to relax.
28. Hoa is a safe driver.
29. We ride slowly.
30. Let's go swimming on the weekend.