All the information except these two pieces _____ writing the article.
A. have been used to B. has been used to C. have been used for D. has been used for
What is the best way you think of ______ the environment?
A. to protect B. protecting C. protect D. protected
---How does your brother like the song Two Butterflies?
---Great! He _____ such a beautiful song before.
A. doesn’t hear B. never hear C. is never heard D. has never heard
--- How are you feeling here?
--- It’s quite hot. I don’t know _____ to go or stay.
A. how B. when C. whether D. where
You_______ play with the knife. You ______ hurt yourself.
A. mustn’t; may B. mustn’t; must C. shouldn’t; must D. can’t; should
Workers can’t be made ________ for twelve hours a day.
A. work B. to work C. working D. worked
