Hearing of Uncle Zhang's heart attack, Doctor Tang was extremely worried and rushed to his bedside immediately.

听说张大爷心脏病犯了，唐大夫心急如火立即赶去抢救。

I'm extremely worried about you.

我非常为你担心。

And there he was with an extremely worried look on his face.

他站在那儿，脸上显得很焦急。

My fiance is extremely worried about the trip and thinks we'll come back with swine flu.

我的未婚夫是非常担心，并认为此行我们得猪流感。