She's/He's my...句型运用 — 英语填空题

英语课上，Wang Bing 向同桌介绍自己的家人：奶奶和爷爷来看他了，家里还有一个妹妹和一个爸爸。请你根据人物的性别，用 She's 或 He's 补全句子（每个词可多次使用）。1. This is my grandmother. ___ my grandmother. 2. This is my grandfather. ___ my grandfather. 3. This is my sister. ___ my sister. 4. This is my father. ___ my father.