— Mrs. Liu, can I pass the final exam if I start working hard from now on?— Of course. __________.
What is the best way you think of ______ the environment?
---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.