28A ⇒ Despite

29A ⇒ didn't use to

30B ⇒ many

31A

32C

33A

34D

35D

36 We used to play these games when we were small.

37 A new school  for poor children will be built next month.

38 Why don't we pay a visit to Ha Long Bay.

39 These pictures are ours.

40 Despite the fact that he was tired, he tried to smile.

31)A

32)C

33)A

34)D

35)D

36)We used to play these game when we were small.

37)A new school will be built for poor children next month.

38)Why don't we pay to visit to Ha Long Bay?

39)These pictures are ours.

40)Despite of tiredness,he tried to smile.