根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意思连贯、完整。

A：Hi, Ann! You look unhappy?

B：0ur English teacher Mrs. Li is ill and now is in hospital.

A ： What is wrong with her?

B：She has a terrible headache.

A：?

B：Since 3 days ago. She is too hard-working to see the doctor. We'd better see her now.

A: Good idea. But do you know the hospital's address?

B：No. Let's ask the policeman over there.

(They walk up to the policeman.)

A：?

B：Sure. Go down Jiankang Road and then turn right. The People's Hospital is right in front. You can't miss it.

A：?

P: No. 2 or No. 9 bus.

A&B：Thank you very much.

P：You're welcome.