Вставить артикли a или an в предложениях.

1. This is a rabbit. 2. This is a snake. 3. This is a green tree. 4. This is an umbrella. 5. This is a red umbrella. 6. This is a vest. 7. This is an orange vest. 8. This is a yellow workbook. 9. This is a pink pen. 10. This is a white egg. 11. This is a black cat. 12. This is a window. 13. This is a dog. 14. This is an orange dog. 15. This is a flag. 16. This is a yo-yo. 17. This is a brown hat. 18. This is an orange. 19. This is a white jug. 20. This is a lamp.