Exercise 1:
1, Strike while the iron is hot.
2, The chairman introduced the speaker;then he left the hall.
3, We don‘t necessarily grow wiser as we grow older.
4, The lecturer will come, or he will send a substitute.
5，I can not afford a new car; besides, I have a old Ford.
6, I will not accept the position, nor I want you to take it.
7, You will not be able to keep your appointment unless you hurry.
8, Put the manuscript where the editor can find it.
9, I do the work; he gets the credit!
10, We were so late that we missed the concert.
11, You have broken the law; therefore, you must be punished.
12, Although he is rich, he is not happy.
13, It wil not be long before I came back.
14, You must not waste time in that life is short.
15, Since you insist, I reconsider the matter.
注：
3，随着年龄的增长，我们不一定会变得更聪明。（from google）