1 is doing
2 is sailing
3 is baking
4 are playing
5 am writing
6 is waiting
7 are drinking

40 D
41 C
42 C
43 C
44 A
45 C
46 B
47 D
48 B
49 C
50 A

A lot of trees in our schoolyard have been cut down

1 I prefer to read in bed
2 I love watching cartoons on TV
3 Does Trung hate doing morning exercise?
4 They love to sunbath and swim 
5 Does she prefer watching TV during her meals?
6 We love skateboarding in the park after school

26 It was silly to lend him money
27 Meeting the president is exciting
28 While we were in the summer holiday, we were happy
29 While the play was being played, they cried twice
30 Writing good compositions in English was not easy

1 survival
2 crops
3 feed
4 solution
5 large-scale
6 significant
7 land
8 environment
9 area
10 percent

1 Formal qualifications
2 volunteers
3 sleep
4 cultures
5 tricky questions 
6 burn-out

câu này chuyển sang bđ thành sữa dc uống bởi anh ta à? :))
nghe vô lí lắm

bé quá cậu mình k nhìn rõ

1 grew
2 went up
3 had
4 was
5 saw
6 rose