___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
We had ___________ wonderful time_________the party_______ other day.
I don't remember___________ to the airport that year.
A man does not know the difficulty of anything_________ he does it personally.
There is a _________ of 1000 dollars for the return
Isn't it very kind __________ your parents to do that for us? A. for B to C. about D. of