Put either "a", "an" or "nothing" in each of these spaces:
1. It's ................ envelope. 2. They are ......... old tables. 3. John has ............ new haircut. 4. It's ........... amazing film. 5. There is ............. tree in my garden. 6. Joan and Mary are ...... very nice people. 7. You're ........... good student. 8. I want ........... apple.