`IV,`
26. B
27. A
28. D
29. C
30. A
`V,`
31. You can use this computer, can’t you?
32. I wish I could remember the answers to these questions.
33. Nam said he had to go to Ha Noi the next/ following day .
34. It takes Nga 4 hours a day to practice English with her friends.
35. It is raining heavily, so we take our umbrellas.
36. Do you mind if I borrow your car?/ Would you mind if I borrowed your car?
37. Tom is always going home late, so his mother is very angry.
38. It is necessary for you to practice English every day.
39. Compost can be made from household and garden waste.
40. The flight 710 to Chicago takes off in ten minutes.