Parents complain their children are behaving unreasonably _____children consider their parents to be old-fashioned.
________our earth,or else it will be no longer fit for us to live on.
—Look!He’s running so fast!—Hard to________his legs were once broken.
—I saw no more than one motor car in that shop.Will you go and buy________?—No,I’d rather buy________ in other shops.
Leave your key with a neighbor ________ you lock yourself out one day.
Forests ________ and burned at such a speed that they will disappear from the earth in the future.