1. I didn't run ... to catch the bus

A. enough fast                  B. fast enough

2. She is ... to know better

A. old enough                     B. enough old

3. We have bought ...

A. milk enough                    B. enough milk

4. She was ... to trust her

A. prudent enough                     B. enough prudent

5. He was ... to trust her

A. enough stupid                     B. stupid enough

Thực hiện dãy chuyển hoá sau:

S -> SO₂ -> SO₃ -> H₂SO₄ -> SO₂

Cân bằng pthh sau :

1. CuO+HCl --->

2. CO₂+NaOH --->

3. K₂O + H₂O --->

4. Cu(OH)₂ ---> 

5. SO₂+H₂O --->

6. Mg(OH)₂+H₂SO₄ --->

7. CuSO₄+NaOH --->

8. AgNO₃+HCl --->

9. H₂SO₄+ZnO --->