Can you guess if they ______ to play basketball with us? –I think they’ll come if they _____ free.

The water in the river nearby will be dirtier than before if nothing __________.

I am used to _______ early and going to bed early. It’s a good habit.

I want to know if I _________ smoke here. —– No, you ___________. Can’t you see the sign “NO SMOKING” there?

Many grocery stores use misting, a process ________ vegetables are sprayed with water, to keep vegetable fresh.