The boy is often found _____in reading books.
____to my regret, I am unable to accept your warm invitation.
We often say that something is “as light as air”, but air is___light.
The boy was______eager to get a geography book.
—— Excuse me, could you tell me the way to the station? —— The station? Take the second turning_____and______.
I was wondering what to do and______Mr. Wang came in.