根据句意或汉语提示补全对话。
Mike: What's ____?
John: My father is ____(生病). He should see a ____(医生). So I can't go to the zoo with today.
Mike: I'm sorry to hear that. Don't be ____( 担忧). We can go next time.
John: Thank you.
Mike: How does your Dad ____(感觉)now?
John: Not well. Let's go to the hospital.
