阅读短文，回答问题。
Mum: What are you doing, Amy?
Amy: I'm writing a letter to my friend, Kitty.
Mum: But how can you? You are only four years old. You don't know how to write.
Amy: Well. It doesn't matter. Because Kitty doesn't know how to read.
1. How old is Amy?
2. What is Amy doing?
3. Can Amy write?
4. Who is Kitty?
5. Can Kitty read?