Here are the corrections for the sentences provided:

1. What does he like? - He is active. (This sentence is correct as is.)

2. **Do** you have a new English teacher?

3. There is **a** new pupil in our class.

4. She is from **Malaysia.** She is Malaysian. (Change "Malaysian" to "Malaysia" in the first sentence.)

5. Hoa's mother is **a** friend. She likes helping others.

Here’s the corrected version of all the sentences together:

1. What does he like? - He is active.
2. Do you have a new English teacher?
3. There is a new pupil in our class.
4. She is from Malaysia. She is Malaysian.
5. Hoa's mother is a friend. She likes helping others.