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.I don't know how to answer that question?

2.Don't forget to cross your ts.

3.Ouch I think I've broken my toe.

4.It was James'father not her mother,who visited her recently.

5.It is a dependable fool proof method.

6.Our company produces many fine products it has,in fact,a reputation for quality merchandise.

7.In the first quarter prices rose 5 per cent;in the second quarter,3 per cent and in the third 7 per-cent.

8.Frank Stanley,III will replace his grandfather,Frank Stanley,Sr.,as president of the company.

9.Stallions yield the highest prices;but mares can also be extremely expensive.

10.Help,Help!Someone has fallen into the river.

答：1.question?→question.2.ts→t’s 3.Ouch→Ouch!4.father→father,5.dependable→dependable,6.products→products;7.third→third,8.Stanley,III→Stanley III 9.prices;→prices,10.Help,→Help!