阅读对话，根据横线后所给标点符号的提示，在横线上填写适当的句子，使对话完整。

(Li Lei is making a telephone call to Martin. an exchange student from England.）

Li Lei: Hello! This is Li Lei speaking. May I speak to Martin?

Martin: Hello, Li Lei. This is Martin. ?

Li Lei: Pretty good! And the situations are getting better and better. The adults return to work and some students go back to school.

Martin: I'm glad to hear that.

Li Lei: What about you? What are you doing?

Martin: I'm writing a book about Chinese people fighting against the novel coronavirus (新冠病毒). I want to show the world Chinese people's union, bravery and wisdom when they face the difficulty.

Li Lei: That's a good idea. ?

Martin: In a month. By then, I want you to be its first reader.

Li Lei: All right. May you succeed!

Martin: .

Li Lei: You're welcome.