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( )。

多项选择题中小学教师职业道德规范的基本内容包括( )。

多项选择题新课程提倡的学习方式是( )。

单项选择题Tom's mother always told him not to smoke again, but ______ didn't help.

单项选择题—Excuse me, where is the nearest bookshop, please —Sorry, I don't know. —______.

单项选择题The police still haven' t found her, but they' re doing all they （）

A. may
B. can
C. must
D. will