The police still haven’t found the lost child, but they’re doing all they .
Our bad living habits will destroy the earth.Only by changing ______ we live can we save the earth.
---I don't feel like going out. Why don't we just stay home and watch TV instead? --- ____You promised to take me out for dinner and to the theatre on my birthday.
---How can you use my computer without my permission? ---Oh, I ________to tell you. I hope you don’t mind.
The school is no longer what it was 20 years ago, _______it was so poorly equipped.
._________alone in the large house, the little boy had to learn to survive by himself.