—We _____ talk loudly when we see the sign “Be quiet” on the wall.—Yes, you are right. We should be polite in public.
________ can make people healthy.
Go to bed early and sleep well. You can work ________ tomorrow morning.
—Could you please tell me how to get on well with my schoolmates? —________
She ________ speaking in front of many people because she is so shy.
—Must we keep the window _______ all the time? —No, you don’t have to.