If you _____ smoke, please go outside.

You look quite tired. You’d better _____a good rest.

 —Mr. Smith, why are you always asking me to do the difficult work?—Because you _______ do such a thing and nobody else is fit for it.

— I regret to say that I          have shouted at you the other day．— Forget it． I was a bit out of control myself．  

—Susan’s parents have bought a large house with a swimming pool.—It               be very expensive.