按要求改正下列句子中的语言错误，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

Ladies and gentlemen,

May I have your attentions, please? In Saturday, July 27th, there will have a few visits to different places. Everyone is welcomed. All the visitors will be divided into four groups. Each group of visitors can visit one of the place – a factory, a farm, a school or a hospital. Please you sign your name at the Service Desk before 9: 00 a.m. and say what place you wish to visit. We’ll set out after the breakfast at 8 and we will return in the afternoon. We will have lunch at place of visit.

We hope you a pleasant journey. That’ s all.

Thank you.

试述虹膜内两种平滑肌的纤维排列、作用和神经支配。