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.