---Morning,class!Good luck to all of you in the exam! 

　　---Morning,teacher.________. 

---I don’t think teenagers should drivecars. 

　　---_______.They aren’t serious enough. 

---If there are______people driving,there will be______air pollution. 

　　---Yes,theair will be fresher. 

---There are many volunteers______are helping the children in Sichuan. 

　　---And most of them are college students. 

---You always spend only a little time on your study.You really_____me down. 

　　---I’msorry,Mum.I won’t do that again. 

---Can you_____your little brother?I’mbusynow. 

---OK.I’ll do it right now. 

---Alltheclerkswenthome_____Mr.Wang.Why? 

　　---Becausehehadtofinishhiswork. 

---Someoftheplasticbagscan’t______afterJune1. 

　　---Yes,peoplewilluseenvironmentalbagsinstead. 

---_____you_____outtheproblem,Sam? 

---Notyet,butI’m going to. 

---Couldyoutellme_____? 

　　---Becauseshelikesherstudentsverymuch. 

---Wouldyoumind______yourbike? 

　　--No,not at all.I’l lput it under the tree right away. 

---_____did you tell him about the news? 

　　---By____ane-mail. 

---______do you go hiking? 

　　---Once a week. 

---What are the people in Korea supposed to do when they meet for the first time? 

　　---They are supposed to_______. 

---The sports shoes must be Linda’s. 

　　---No,they_____be.They’re too small forher.