题目内容：
John ：Hello ！Is that Mike speaking? Mike: 51
John ：Mike, do you enjoy your new school?
Mike ：Yes, very much. But things are quite different here.
John:Really? 52 ？
Mike ： Yes. I go to school every day. But on Friday afternoon we do a lot of activities in the
school clubs.
John: Sounds great！ 53 ？
Mike：Seven subjects. They are English, math, history, science ,physics, art and P. E.
John: 54 ？
Mike ：I like math best. My math teacher says I am doing well in it.
John：Well done! Will you come back this summer?
Mike：Sure！See you then!
John ： 55
根据对话，回答题：
请在51处填写正确答案；
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：