10.informal adj. 非正式的 (formal 正式的)
E.g. this is an informal meet。
This is a formal dinner。
11.curtsey v。屈膝行礼
E.g. people usually curtseyed to the Queen in the past。
12.be determined to 决定，一定
E.g. He is determined to pass the exam despite of any difficulty。
He is determined to go abroad for further study。
13.in the air 在传播； 不定的，未定的
E.g. My plans are still quite in the air。我的计划还尚未定案。
There are rumors in the air that he was once a thief。
14.bring about 带来，导致
E.g. The big noise has brought about many complains。
The war in the area brought about a lot of post-war problems。
Science has brought about many changes in our lives。
15.come to 渐渐地；谈到，
E.g. I come to love classical music by day。
He came to realize the importance of friendship after so many incidents。
When it comes to the profit， they show enough confidence。
16.be keen to do / be keen on doing 急切，热衷于
E.g. He is keen on making new friends。
Mr. Bright is keen to buy a new car。
17.major in 主修，专业是 (specialize in)
E.g. My sister now majors in computer science。
His friend majors in oriental History。
18.confine v. 限制，局限，禁闭
E.g. please confine yourself to the subject under discussion。
He is confined to the wheelchair after the car accident。
19.get oneself into hot water 使陷入困境
E.g. Because of his own gossip， he got himself into hot water。
Without the help from his parents， it was hard for him to get out of hot water。
