Exercise1: Điền “is” hoặc “are” vào trong câu sao cho thích hợp. 1. There ………. many animals in the zoo. 2. There ……….. a snake in the window. 3. There………… a zebra in the grass. 4. There ………… lions in the zoo, too. 5. There……………. many baby lions near their parents. 6. There…………… a bird next to the tree. 7. There…………….. many monkeys in the trees. 8. There ………….. an elephant in the zoo. 9. There…………… some water in the lake near the elephants. 10. There ………….. birds in the zoo. 11. There …………….. many people visiting the animals today. 12. There……………. many children, too. 13. There ………………. a gorilla in the tree. 14. There ……………… some grass under the tree. 15. There ……………. bananas in the tree with the gorilla. 16. There ………………. many birds near the gorilla. 17. There………………… a rock near the tree. 18. There ……………..many sharks in the aquarium. 19. There…………… an eel in the aquarium, too. 20. There………….. lots of water for the fish. 21. There……………….. many animals to see at the zoo.