根据对话内容，在每个标有题号的空白处填人一个适当的句子，使对话完整、合乎情景。
A: Be quick, Betty. Your uncle is waiting for you at the school gate.
B: My uncle? No, I don't have an uncle.
A: 小题1: ?
B: He is my grandpa.
A: Really? But he looks so young. 小题2: ？
B: He is 61.
A: Why is he waiting for you?
B: Today is my grandma's birthday. I will help my grandpa buy some presents for my grandma.
A: Did they buy presents for each other in the past?
B: 小题3: . They usually bought very special presents for each other.
A: 小题4: ？
B: They got married in 1976.
A: Does your grandpa still work?
B: 小题5: . He retired (退休) last year.
小题1:(Then) Who is he?
小题2:How old is he?
小题3:Yes, they did.
小题4:When did they get married?
小题5: No, he doesn't.
对话内容是Betty与另一同学在谈论自己的爷爷。
小题1:根据答语，对my grandpa提问，用who。
小题2:根据答语，对61这个年龄提问，用how old。
小题3:根据后面的补充“They usually bought…”，可知使用肯定回答。
小题4:根据答语，对in 1976这个时间进行提问，用when。
小题5:根据后面一句“He retired last year.”可知，他不上班了，确定使用否定回答。