三、下面每句都有一个标点符号错误，该用标点处未用标点或标点符号用错，改正错误或补写标点。

　　1.You should sign all letters before mailing them 2.Do you market your product through retailers.

　　3.The weather was good yet the plane arrived an hour later. 4.The accountant Mr. Price, delivered a long presentation. 5.What a nice girl she is.

　　6.There are three requirements for the job, foreign language knowledge, working experience and an MBA degree.

　　7.We have to constantly renew our knowledge, because, science and technology are developing so rapidly.

　　8.Investors’ expectations are high, therefore, competitive bidding for breeding animals is brisk.

　　9.The personnel manager stated, We only hire persons with an MBA degree for that type of position.

　　10.Our offices are located in Atlanta, Georgia and Birmingham Alabama.

　　答:　1.them→them.　　2.retailers.→retailers?

　　3.good→good，　　4.accountant→accountant，

　　5.is.→is! 　　6.job，→job：

　　7.because，→because 　　8.high，→high;

　　9.stated，→stated，“position.→position 　　10.Birmingham→Birmingham