Complete the sentences filling the blanks with the correct forms 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?