合作学习理论认为，在班级教学中，学生群体的组织形式有三种，即( )。

单项选择题How much ______ she looked without her glasses!

单项选择题The headmaster went to Washington ______ the first time last September.

单项选择题—______your step ,Jim, or you might fall into the water. —Oh,dear! Look where I am going.

单项选择题Does ______ matter if he can't finish the job on time

单项选择题Since our knowledge is ______ none of us can exclude the possibility of being wrong.