The MP3 is used for _______ music.
I’m sorry I kept you ______ for a long time.A. wait B. waiting C. waited
We should eat ________ food so that we can enjoy a better life.A. healthy enough B. enough health C. enough healthy
--Would you mind _______ my dog when I am away? --Of course not.A. looking after B. taking care C. keeping away
My mother asks us _______ fingernails long.A. keep B. to keep C. not to keep
The old man didn’t have a rest ______ his son came back..A. after B. until C. when