一、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.The embargos on shipments from certain countries encourage trade with friendly nations.

2.Sinopec plans to set up joint ventures with three foreign oil giants,allow them each 500 stations within three years.

3.There is usually more labor piece among office workers than in factories.

4.Although he joined the firm only last year,he is already senior than me.

5.He told me that New York is larger than any city in America.

答：1.embargos→embargoes 

2.allow→allowing 

3.piece→peace 

4.than→to

5.any city→any other city