The model plane is made __________ used wood and glass.
—I saw you come to school by bus this morning. —Oh, I _______ come to school by bus, but it is raining today.
—Who taught ________ to write the computer programs? —Nobody. She learned it by __________.
Last month I travelled across the Sahara Desert bycamel with some locals. Whatamazing experience!
— Shall I buy this comic book for Dick? —. He might already have it.
—Why did Miss Wang look so worried when we saw her? —Because she wondered .