16. C

17. B

18. B

19. A

20. C

21. A

22. C

23. D

24. D

26. A

27. C

28. A

29. B

30. C

31. C

32. C

33. C

34. C

35. D

36. D

15. D

16. D

17. B

18. C

19. A

20. A

21. C

22. D

23. A

24. A

25. D

26. A

27. D

28. C

29. D

30. B

31. A

6. B

7. D

8. B

9. B

10. B

11. A

12. D

13. A

14. C

1. He said if he had a permit, he could get a job.

2. He said if she had loved Tom, she wouldn’t have left him.

3. He asked me what I would do if I had time.

4. She said if I wanted to lose weight, I had to eat less bread.

5. He said if he had a map, he would lend it to me.

1. How often does your father go to work?

2. What are they doing at the moment?

a) M = \(\dfrac{\sqrt{x}}{\sqrt{x}-2}-\dfrac{4\sqrt{x}-4}{\sqrt{x}\left(\sqrt{x}-2\right)}\) = \(\dfrac{x-4\sqrt{x}+4}{\sqrt{x}\left(\sqrt{x}-2\right)}\) = \(\dfrac{\left(\sqrt{x}-2\right)^2}{\sqrt{x}\left(\sqrt{x}-2\right)}=\dfrac{\sqrt{x}-2}{\sqrt{x}}\)

b) Ta có: x = 3 + 2\(\sqrt{2}\) = (\(\sqrt{2}\) + 1)² => \(\sqrt{x}\) = \(\sqrt{2}\) + 1

=> M = \(\dfrac{\sqrt{2}+1-2}{\sqrt{2}+1}=\dfrac{\sqrt{2}-1}{\sqrt{2}+1}=3-2\sqrt{2}\)

c) M = \(\dfrac{\sqrt{x}-2}{\sqrt{x}}\)

Ta có: \(\sqrt{x}\) > 0 ∀x > 0 => Để M > 0 thì \(\sqrt{x}\) - 2 > 0 ⇔ \(\sqrt{x}\) > 2 ⇔ x > 4