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。<br /> 1.I don&#39;t know how to answer that question?<br /> 2.Don&#39;t forget to cross your ts.<br /> 3.Ouch I think I&#39;ve broken my toe.<br /> 4.It was James&#39; father not her mother,who visited her recently.<br /> 5.It is a dependable fool proof method.<br /> 6.Our company produces many fine products it has,in fact,a reputation for quality merchandise.<br /> 7.In the first quarter prices rose 5 per cent;in the second quarter,3 per cent and in the third 7 per-cent.<br /> 8.Frank Stanley,III will replace his grandfather,Frank Stanley,Sr.,as president of the company.<br /> 9.Stallions yield the highest prices;but mares can also be extremely expensive.<br /> 10.Help,Help!Someone has fallen into the river.