Look! A man is cutting a tree on the moon. –It ______ be true. The teacher said there is no air on the moon.

You should ______ the shower when you are washing your hair.—OK. I will. We need to save water.

Under no circumstances, he was warned, _____ to give the password to someone else.

I’m sorry, I____________ the book in my home.

______ is no wonder that people say that computers are ______ the world.