Some ______are ______their time to help the poor in underdeveloped countries.
---How does your brother like the song Two Butterflies?---Great! He _____ such a beautiful song before.
-- How are you feeling here? --- It’s quite hot. I don’t know _____ to go or stay.
You_______ play with the knife. You ______ hurt yourself.
Workers can’t be made ________ for twelve hours a day.
--Did you see who the driver was?---No, the car ran so fast _____ I couldn’t get a good look at his face.