32. I think you should (do) ______do________ morning exercises regularly.

33. They used (go) ____to going__________ to work by train.

34. Don’t let children (play) ____play__________ with matches.

35. You ought to (do) ______do_______ the homework yourself.

36. My father stopped (smoke) _____smoking_________ five years ago.

37. Mai doesn't have enough money (buy) _____to buy_________ a new bicycle.

38. I need (buy) _______to buy_______ some notebook.

39. My teacher said I should (spend) ___spend___________ more time on my English

. 40. Mr Hung told me (tell) __to tell____________ him the truth.

41. Nga likes ( play) _____playing_________ badminton. 42. They asked their children ( stay) ____to stay__________ at home.

43. Nam must (do) _______do_______ the homework himself.