. Early to bed and early to rise _____ a man healthy , wealthy and wise .
A left-luggage office is a place where bags ________ be left for a short time, especially at a railway station.
—I heard that they went skiing in the mountains last winter.—It ________ true because there was little snow there.
—Who is the girl standing over there?—Well, if you ________ know, her name is Mabel.
You and I could hardly work together,________?
—It’s the office! So you ________ know eating is not allowed here.—Oh, sorry.