1. cavity洞 穴

　　I’m afraid there won’t be time to do aother tooth today, make sure you don’t eat anything like steaks for the next few hours,and we’ll fill the other cavity tomorrow.

　　All right. Actually, I must hurry to the library to return some books.

　　2. ceremony典礼 仪式

　　If the flag just display on such occasions, do not allow the flag to fall to the ground. But let it be carried high up in the air to form a feature of the ceremony.

　　3. cetainly必定 当然

　　Your dog certainly seems to know you’re his master. Did you have to punish him very often when you trained him?

　　I found it’s better to praise him when you obeys and not to be so fussy when he makes mistakes.

　　4. challenge挑战 向…挑战 对……质疑

　　The assignment on physics is a real challenge, I don’t think I can finish it on time all by myself.

　　Why don’t we join in our feet together? It may be easier then.

　　5. chamber室 会所

　　The local chamber of commerce, which represents the industry in the area, hired me as a consultant to do a one-year study on fishing in the Biramichi river and write report for them.

　　6. champaign香槟酒

　　Ann, how much champaign did they drink?

　　A lot, it was more popular than mineral water.