26. B

27. A

28. B

C

I would like a cheeseburger.

1. B

2. D

9. A

10. D

1. started

2. living

3. built

4. didn't join - had

5. keeping

6. is - passed

7. do - to stay

8. often sleep

sun

2. are sent

3. are dried

4. is covered

5. are made

6. is usually added

7. is often eaten

\(B=\left(\dfrac{1}{\sqrt{x}}+\dfrac{1}{3-\sqrt{x}}\right):\dfrac{1}{3-\sqrt{x}}\)

\(=\left(\dfrac{3-\sqrt{x}}{\sqrt{x}\left(3-\sqrt{x}\right)}+\dfrac{\sqrt{x}}{\sqrt{x}\left(3-\sqrt{x}\right)}\right).\left(3-\sqrt{x}\right)\)

\(=\dfrac{3-\sqrt{x}+\sqrt{x}}{\sqrt{x}\left(3-\sqrt{x}\right)}.\left(3-\sqrt{x}\right)\)

\(=\dfrac{3}{\sqrt{x}}\)

some => any

- some thường dùng trong câu khẳng định

- any thường dùng trong câu phủ định và nghi vấn

igloo (n): lều tuyết