24. B

25. A

26. A

27. B

28. D

29. D

30. A

31. B

32. C

The woman told me that her sister hadn't gone to Ha Noi with her the previous year.

i, 90/x - 36/x - 6 = 2       ( ĐKXĐ: x ≠ 0;6)

=> 90(x - 6) - 36x = 2x(x - 6)

<=> 90x - 540 - 36x = 2x² - 12x

<=> 90x - 36x - 2x² + 12x = 540

<=> 66x - 2x² = 540

<=> -2x² + 66x - 540 = 0

<=> (x - 18)(-2x + 30) = 0

*TH1: x - 18 = 0 <=> x = 18 (Tm)

*TH2: -2x + 30 = 0 <=> x = 15  (Tm)

Vậy tập nghiệm pt S = { 15; 18 }

Samuel has kept a diary for 5 years.

1. B

2. D

3. C

4. D

5. A

6. B

7. C

8. C

9. A

10. C

11. A

12. C

13. A

14. B

15. C

16. A

17. B

18. A

19. D

20. A

Bn kiểm tra kĩ xem có chỗ nào mk sai thì sửa nha! Chúc bạn học tốt!

VIII.

1. John said that he couldn't chat because he was working then.

2. David told me that his brother had written this book the previous year.

3. Jane told us that she was having dinner with Rachel the next day

4. The student said that they had worked very hard that day and it had paid off.

5. Tom told me that he would see me there the following Friday.

6. They told Maria that they would be writing to her later that week.

7. Nicky said that she didn't know where Bill was living at that moment. (chỗ này mk cx ko chắc là giữ nguyên at the moment hay chuyển thành at that moment)

8. Susan said that her parents had left for London at 5p.m the day before.

9. Nick told Sarah that he might see her the following week before he left.

10. Matt said that he hadn't attended the meeting 2 days before.

IX.

1. the following day

2. had had

3. hadn't seen

4. the next day

5. wouldn't be

1. Solutions will be found (by the scientists) to reduce pollution in our city.

2. More regulations will be made (by the government) to reduce industrial.

3. More wind turbines will be constructed in that area to produce electricity. 

4. With that device the wave energy will be changed into electricity.

5. Alternative sources of energy will be developed.