—Where is the post office?—It's just over there, at the end of the street. You          not miss it.

Can you imagine that a smart man like him_____ make such a stupid mistake?

— Did you go to the lecture by the visiting professor?— No. I ______ it, but I've been busy taking care of my grandma in hospital these days. 

If I ________ you，I ________ more attention to English idioms and phrases.

—Where have you been?— I ______ in the heavy traffic. Otherwise I ______ here earlier.