根据下列各图填空完成对话。

（1）A：What are you doing, Sam？
B：I am _________.
（2）A：_____ is she？
B：She is Mary.
A：_____ is she doing？
B：She’s writing.
（3）A：_____ _____ your sister？
B：Yes, she is.
A：What ______ _____ _____？
B：She is working.
（4）A：Do you like English？
B：No, I ______.
A：What do you like best？
B：I like ______ best.
（5）A：_____ ______ _______ _______？
B：I’m from England.
A：_____ ______ like singing？
B：Yes, I do.