6. Keeping the environment clean is very important. -> It is 7. I like walking more than riding:a bike. -> I prefer 8. He is a skillful soccer player, -> He 9. Remember to wake me up at 5 a.m. -> Don't forget 10. My brother is a safe taxi driver. -> My brother drives 11.What happened to you? -> What was 12. How tall are you? -> What's 13. You shouldn't play football on the street. -> You had 14. I don't like durian; my sister doesn't like durian. -> I don't 15. How much is the red shirt? -> What 16. Our teacher wants us to clean the board before he comes in. -> Our teacher would 17. You should not stay up late. -> You ought 18. How tall is John? -> What 19. How about going out for dinner tonight. -> Would you like 20. My mom likes walking better than cycling. -> My mom prefers 21. What's your daughter's age? -> How 22. Minh wasn't at home last night, and neither were his parents. -> Minh wasn't at home last night, and his 23. Thanh speaks English very well. -> Thanh is 24. Nam likes to stay at home better than to go to the zoo. -> Nam prefers 25. What happened to her? -> What 26. How high is the building? -> What 27. Mrs. Oanh can cook very well. -> Mrs. Oanh is 28. Huong likes to watch movies than football -> Huong prefers 29. How heavy is your father? -> What 30. Nam should study harder this semester. -> Nam ought