几道英文解释句子.帮我改一下对还是错.

几道英文解释句子.帮我改一下对还是错.
What an interesting story this is!
改:How interesting this story is!
What do you think of the film?
改:How do you like the film?
Let's sing the English song,shall we?
改:Shall we sing the English song?
Mr.Smith paid 100 dollars for the books.
改:The books cost Mr.Smith 100 dollars.
按要求改写句子:
Mr.Smith decided to go to the concert.(go to the concert划线提问)
Where did Mr Smith decide to go?(Where可以吗?还是What?)
Thank you for inviting me to your birthday.
我的回答:Never mind.还是应该That's all right还是All right)
最后那个回答问题.只有三个选项.就是Never mind/That's all right还有All right.