33. It was a four-hour flight from Ho Chi Minh City to Bankok.
->It took...
34. Practicing speaking English every day, or you cannot improve your English.
->If...
35. My mother doesn't usually go to work without having breakfast.
->My mother isn't used.
36. Kjell Lindgren is a NASA astronaut. He is replacing items inside the ISS.
->Kjell Lindgren .
37. This English course is very helpful for me. The course concentrates on developing communicative skills.
(that)
38. There has been a considerable improvement in the quality of life in the countryside (considerably)
39. The bus left at 9 o'clock and we arrived just after that. (when)
40. When did you break your leg? (How long)
________________________
33. It took four hours to fly from Ho Chi Minh city to Bangkok.
34. If you don't practice speaking English every day, you cannot improve your English.
35. My mother isn't used to going to work without having breakfast.
36. Kjell Lindgren, who is replacing items inside the ISS, is a NASA astronaut.
37. This English course that concentrates on developing communicative skills is very helpful for me.
38. The quality of life in the countryside has considerably improved.

39. When we arrived, the bus left.
40. How long have you broken your leg?