If water becomes increasingly scarce in decades ________,water shortage will become a hot issue all over the world.
The question is _____ of great importance.
—Here are the best styles of the clothes. Which one do you like?— _______. They are not so nice as I expected.
A table made of steel costs more than _______ made of wood.
Do you know _______ friends are coming to our party?
_____ comes is welcome.