`29.` Environmentalists (Trước tobe là một danh từ, tobe là are nên danh từ để dạng số nhiều)

`30.` distinguishing (have difficulty + V-ing: có khó khăn trong việc gì)

`31.` preparation (make preparation for sth: chuẩn bị cho cái gì)

`32.` Disappointingly (đứng đầu câu là một trạng từ)

`33.` inefficient (Trước danh từ products là tính từ bổ nghĩa)

`34.` disastrous (Trước danh từ effect là tính từ bổ nghĩa)

`------`

`35.` Easter is a joyful festival which is celebrated in many countries.

`36.` Some scientists believe that mobile phones are responsible for some health problems.

`------`

`37.` The last time we traveled abroad was 2 years ago.

`38.` My friend, whose tests are always done carefully, is a hard student.

`39.` If she had her old friend's phone number, she could contact her.

`40.` Peter felt quite depressed about the visit to the gallery.

@ `Ly`

VII:

29. environmentallists

30. distinguishing

31. preparation

32. disappoitingly

33. inefficient

34. disaoustrous

VIII:

35. Easter which is celebrated in many countries is a joyful festival

36. Some scientists believe that mobile phones are resposible for some health problems

IX:

37. The last time we traveled abroad was two years ago

38. My friend, who always does her tests carefully is a hard student

39. If she had his phone number, she could contact her old friend

40. He felt quite depressed about the visit to the gallery