Sam is a waiter, _____ he really wants to be a singer.

Could you tell me where _______ the post office— ________ I didn’t hear it clearly.

__________the doctors in their hospital is about one thousand, and sixty percent of them___________ women.

I didn’t _________my uncle for a month.I miss him very much. Which is wrong

The number of the books in our library _________ about 20,000.