Viết lại câu sao cho nghĩa không đổi. 1.How old is your grandmother ? -> What... 2. What is the heaviness of the pig ? -> How… 3. How much is your car ? -> What… 4. How much do you weigh ? -> How heavy… 5. What was her height last year ? -> He… 6. He went to school on foot yesterday. -> He… 7. What is his sister’s address ? -> Where… 8. Her hair is black. -> She… 9. I spent two hours doing my homework yesterday. -> it…