`4`. The air is polluted, people don't like to live there.

Because of the polluted air, people don't like to live there.

`5`. Computers can be used for various purposes, so they become very popular today.

Because of can being used for various purposes, computers become very popular today.

`6`. Because it was rainy, we couldn't go picnic.

Because of the rain, we couldn't go picnic.

`7`. Because the weather is hot, we go to the beach.

Because of the hot weather, we go to the beach.

`8`. Because Tom understands the lesson, he could apply in the exercises.

Because of understanding the lesson, Tom could apply in the exercises.

`9`. They played very well. Therefore, they won the game.

Because of playing very well, they won the game.

`10`. There was a big storm, so they had to cut off the power.

Because of the big storm, they had to cut off the power.

+) Because of + Ving/N: bởi vì ...

4. The air is polluted, people don't like to live there. 

⇒ Because of the polluted air, people don't like to live there. 

5. Computers can be used for various purposes, so they become very popular today. 

⇒ Because of being used for various purposes, computers become very popular today. 

6. Because it was rainy, we couldn't go picnic.

⇒ Because of the rain, we couldn't go picnic.

7. Because the weather is hot, we go to the beach. 

⇒ Because of the hot weather, we go to the beach. 

8. Because Tom understands the lesson, he could apply in the exercises. 

⇒ Because of understanding the lesson, he could apply in the exercises. 

9. They played very well. Therefore, they won the game.

⇒ Because of playing well, they won the game.

10. There was a big storm, so they had to cut off the power.

⇒ Because of the big storm, they had to cut off the power.