根据句意和汉语注释，写出单词的正确形式。

小题1:I wonder how many ______ (手术) ORBIS doctors perform during their visit to a poor country.

小题2: You won’t see this kind of insect _______ (遍及) the whole winter.

小题3:September is the _________(九) month of the year.

小题4: Children’s behavior is often _______ (影响) by what their parents do.

蛞蝓（俗称鼻涕虫）属哪一纲（）。

A、涡虫纲

B、无板纲

C、腹足纲

D、肉足纲