---You look tired.---Yes. I want __________ to bed.
—The second-hand smoke is even more terrible.—That’s right. It does great ______ to people around.
My brother is an active boy, he often risks _____ mountain with his friends.
—What’s wrong with my son?—______Serious, it’s only a cold.
I can’t go to bed because I still have _____ homework to do.
Simon, you’d better ______ enough water, it’s hot today.