Вставьте нужную форму глагола to be (am/is/are)

1. They are red apples. 2. How old is Pete? 3. She is a nurse. 4. How old are they? 5. He is from Russia. 6. How old are Olga? 7. We are good pupils. 8. How old is my granny? 9. I am a little elf. 10. How old are you? 11. It is a big black dog. 12. How old are Lucy and Tim?