We should buy things ____ locally.
--- You always spend only a little time on your study. You really _____ me down. --- I’m sorry, Mum. I won’t do that again.
---There are many volunteers ______ are helping the children in Sichuan. --- And most of them are college students.
---If there are ______ people driving , there will be ______ air pollution. --- Yes, the air will be fresher.
--- I don’t think teenagers should drive cars. --- _______. They aren’t serious enough.
--- Morning, class! Good luck to all of you in the exam! --- Morning, teacher. ________.