Fill in the blanks with the correct form of 'be' or 'do' in the present simple.

1. He **is** very friendly at school. 2. **Do** you like coffee or tea? 3. They **do** not know the answer to the question. 4. My brother **is** a doctor. 5. Where **do** you live? 6. The weather **is** always nice in spring. 7. Why **is** she always late for class? 8. I **am** very tired after work. 9. **Do** your parents speak English? 10. She **is** very good at math. 11. **Do** you have any pets? 12. We **are** from Canada. 13. **Do** you go to the gym regularly? 14. This **is** my favorite book. 15. What **does** he do for a living?