REVIEW

21. Because he sits around too much, he isn't fit

-> if he didn't sit around too much, he woudn't fit

22. Rita was exhausted because she didn't get any sleep

-> if rita had got sleep,she wouldn't have been exhausted

23. She's very thin; perhaps that's why she feels cold so much

-> if she weren't thin,she wouldn't feel cold so much

24. He never polishes his shoes, so he never looks smart

-> if he polished his shoes, he would loook smart

25. He can't park near his office;that's whyvhe doesn' come by car

-> if he could park near his office,he would come by car

26. My house is guarded by two big dogs. That's the only reason it isn't broken into every night

-> if my house weren't guarded by two big dogs.,it would be broken into every night

27. The flats were not clearly numbered, so it was very difficult to find them

-> if the flats had been clearly numbered, it wouldn't have been very difficult to find them

28. I don't know her email address so i can't tell you

->if i knew her email address sI could tell you

29. She doesn't live in london because she doesn't know anyone there

-> she would know someone there if She lived in london

30. I couldn't live in the country because i couldn't find a job here

->i could live in the country if i could find a job here

31. She had no time to play with her children because she worked in the evening

-> if she hadn't worked in the evening,she would have had time to play with her children

32. He doesn't see the signal so he doesn't stop his car

-> if he saw the signal ,he wouldt stop his car

33. Marry doesn't have enough money so she can't buy a new car

-> marry could buy a new car if she had enough money

34. Prepare the lesson well or you won't understand it

-if you don't Prepare the lesson well ,you won't understand it

35. He doesn't apply for thr job because he doesn't have enough qualification

-> if he had enough qualification.he would apply for thr job

36. Hurry up or we will be late for the exam

-> if we don't Hurry up ,we will be late for the exam

37. They do not understand you because you do not often talk to them

-> unless you often talk to them,They do not understand you

#FIX

1/The(A) first color(B) TV was(C) introduced since(D) ?

(thiếu đề,xem lại đề =))

3/The student leanred(A) much about(B) kepping(C) the environmental pollution(D)

=>stopping/reducing