When we sleep is cultural as biological-and practices differ greatly round the globe.
—Who____ it be that is knocking at the door? —It ____ be Father, but I’m not sure.
My uncle’s house in the downtown area is much smaller than ours, but it is ______________ expensive.
Having said goodbye to their friends, they _______ for home. A. set about B. set up C set down D. set off
—Did the winner of the English Contest behave well?—Really. She made a deep ________ on the judges.
It had been half an hour before she found herself _____ in the wrong direction of her home.