Here are the sentences with the mistakes underlined and corrected:

1. She didn't **went** to visit Susan last month.
**Correction:** She didn't **go** to visit Susan last month.

2. He never **do** any volunteer work.
**Correction:** He never **does** any volunteer work.

3. **Matha** is a great **cooker** and she often cooks dinner for homeless people.
**Correction:** **Martha** is a great **cook** and she often cooks dinner for homeless people.

4. Kim **meeting** her best friend last Monday.
**Correction:** Kim **met** her best friend last Monday.

5. She is **walk** to the supermarket.
**Correction:** She is **walking** to the supermarket.

6. Before **donate** a book, make sure that it is in good condition.
**Correction:** Before **donating** a book, make sure that it is in good condition.

7. We should encourage people **recycle** glass, cans, plastic, and paper.
**Correction:** We should encourage people **to recycle** glass, cans, plastic, and paper.

8. Did you **lived** in Vancouver when you were young?
**Correction:** Did you **live** in Vancouver when you were young?