1. ✗          

2. ✗           

3. ✓          

4. ✓

Transcript:

1. A: Why do you like music, Nam?

B: Because I want to be a singer.

2. A: Do you like art, Lucy?

B: Yes. I like art because I want to be a painter.

3. A: What’s your favourite subject, John?

B: I like English. I want to be an English teacher.

4. Why do you like maths, Linh?

B: Because I want to be a maths teacher.