I used to dance．
Now I enjoy dancing．
You had to get a good camera and buy films（胶卷）．
Did you used to collect stamps?
You’ve changed a lot．
It helps me to be more careful and it gives me a lot of fun．
You used to listen to music, didn’t you?
A：D 1E
B：Yes, I did, but now I am interested in listening to music and playing the violin．When I am free, I enjoy playing it．
A：B 2F
B：That’s right．What do you like doing now, Jack?
A：C 3
B：That’s a good hobby．What do you think of it?
A： 4
B：What did you use to do?
A：I used to take photos．
B：I think taking photos is expensive． 5 Am I right?
A：You are right．So I don’t do it now．
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解析：
【小题1】从答语Yes, I did,可知问句是过去时的一般疑问句，选D
【小题2】从上文的句子：When I am free, I enjoy playing it．可知这个人改变了许多。选E
【小题3】从后面的句子：That’s a good hobby可知是说喜欢跳舞。选B
【小题4】从问句看What do you think of it?可知是问对它的评价。选F
【小题5】从前面的句子：I think taking photos is expensive．可知拍照需要一些设备。选C