1 A => ought to

2 A => to leave

3 A => is

4 C => up

5 B => upstairs 

1: A: ought => ought to

2: A: leave => to leave

3: A: are => is

4: C: on => up

5: B: upstairs => upstairs 

11 D => bỏ

12 C => which

13 B => to which

14 A => who

15 B => where

16 C => will join in

17 D => at

18 D => with

19 D => bad for

20 B => of

21 A => for

1 D => on

2 A => betweem

3 B => so

4 B => knew

5 B => because

q, is => are

2. a most => the most

dòng 3 mình thấy đúng mà nhỉ?

get => gets / beautifully => beautiful 

celebrate => celebrated

1 B => so

2 D =>two years

3 D => including

4 A => takes place

5 B => is held

1 their

2 Peter's

3 mine

4 boys'

5 her

6 ours

7 yours

8 her

9 their

10 hers

1 Although => However

2 however => but

3 However => but

4 But => although

5 although => but