Ex3:

26. T

27. T

28. F

29. T

30. T

Ex4: 

31. tiring

32. do 

33. far

34. keeping

35. used

Ex5:

36.Chưa nghĩ ra

37. My younger sister is terrified with horror films.

38. Chưa nghĩ ra

39. His mother is very happy because he got the first prize at the competition.

40. She was late because it rained 

$Chúc,bạn,học,tốt,điểm,A+$

III) 

26. F

27. T

28. F

29. T

30. T

IV) 

31. tiring -> tired

32. do -> don't

33. far -> long

34. keeping -> keep

35. used -> use

V) 

36. My father used to go to work by car some years ago, but now he goes by bus

37. My younger sister is terrified with horror films.

38. Japanese Boys' Day is celebrated by the Japanese people on May 5th

39. His mother is very happy because he got the first prize at the competition.

40. She was late because it rained