16 success

17 disappearance

18 important

19 participants

20 scientific

28 D

29 B

30 A

1 They said they would go on a picnic the day after

2 Ba said he could do that exercise

3 Lan said she had to finish that work in time

4 My mother said the flowers were beautiful

5 He said he liked math

6 She said they were playing soccer

B

23 D

24 C

1 A

2 C

3 C

4 B

5 C

6 A

5 She asked her boyfriend which dress he liked best

6 She wanted to know what they were doing

7 He wanted to know if they were going to the cinema

8 The teacher wanted to know who spoke English

9 She asked me how I knew that

1 A

2 C

3 C

4 C

25 A network of wind turbines was installed to generate electricity

26 Mai wanted to know if Jane often go to that swimming pool

27 If you don't speak clearly, people won't understand you

28 I haven't gone to my hometown for 3 years

29 No one in the club plays tennis as well as Barbara

30 Although the sea was rough, the children went swimming

24 D

25 B

27 B

5 B

6 A

7 C

8 C

9 B

10 B

11 A

12 A

13 B

14 B