—Jane, why are you so happy?—The hen I keep for half a year ________an egg yesterday.
The red suitcase is expensive ______it’s made of leather.
Could you show me how to ________ this new recorder?
Some people think that CD-ROMs will soon be _________ books.
I didn’t _____ you were going to leave_____ 3 o’clock.
A human ______ can do some things better than a computer, for example, creating new ideas.