1. Somebody has taken some of my books away.

→ Some of my books have been taken away.

2. They have provided the victims with food and clothing.

→ The victims have been provided with food and clothing.

3. A sudden increase in water pressure has broken the dam.

→ The dam has been broken by a sudden increase in water pressure.4. 

4. Luckily for me, they haven't called my name.

→ Luckily for me, my name hasn't been called.

5. They have bought the land next to my house.

→ The land next to my house has been bought.

1. Somebody has taken some of my books away.

→ Some of my books have been taken away.

2. They have provided the victims with food and clothing.

→ The victims have been provided with food and clothing.

3. A sudden increase in water pressure has broken the dam.

→ The dam has been broken by a sudden increase in water pressure.4. 

4. Luckily for me, they haven't called my name.

→ Luckily for me, my name hasn't been called.

5. They have bought the land next to my house.

→ The land next to my house has been bought.

Đáp án: X là Cl

- Ta có:

+ Tổng số phần tử trong nguyên tử X là 52:

→ 2Z + n = 52 (1)

+ Số hạt không mang điện nhiều hơn số hạt mang điện âm là 1:

→ - Z + n = 1 (2)

- Từ (1), (2), ta có: 

\(\left\{{}\begin{matrix}2Z+n=52\\-Z+n=1\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}Z=p=e=17\\n=18\end{matrix}\right.\)

Vậy: X là Cl

- Peter said: "Do you ask any questions about me, Mary?"

→ Peter asked Mary if Mary asked any questions about him.

C. 9

1. longest

2. more slowly

3. mine

4. newer

5. the most intelligent

6. quickly

7. faster

8. as

9. nicer

10. second

D

1. are

2. is

3. is

4. is

5. are

6. is / is

7. is

8. are

9. are

10. are

Ta có: 

- Tổng số hạt trong nguyên tử X là 28:

2Z + n = 28 (1)

- Tổng số hạt mang điện là 18:

2Z = 18 → Z = 9

Thay vào (1), ta có:

2.9+n=28 → n = 10

Vậy số hạt nơtron trong nguyên tử X là 10

1) There

2) There

3) It

4) It

5) It

6) It

7) There