按要求完成下列句子,每空一词。 1. This is my friend. (改为一般疑问句) _____ _____ your friend? 2. —Is she your cousin? (作否定回答) —No, _____ _____. 3. Those are my brothers. (改为单数句) _____ _____ my _____. 4. Emma is her sister. (同义句改写) Emma _____ she _____ _____. 5. This is a backpack. (把a换成two改写句子) _____ _____ two _____.