用恰当的词语填空，完成对话。每空一词。

(An Old lady is coughing. She looks weak.)

Kangkang: Good morning, Granny. What's wrong with you?

Granny: Oh, boy. It's difficult for me to 1______.

Kangkang: How 2______ have you been like this?

Granny: I've been like this 3______ last week.

Kangkang: Have you seen a doctor?

Granny: No, I haven't. The chemical factory produces terrible gas. The bad air makes my chest 4______.

Kangkang: That's too bad. Pollution causes too many problems. I think I should write to the newspaper

                about these problems. But now you'd 5______ see a doctor.