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

单项选择题Duty is an act or a course of action that people（）you to take by social customs, law or religion.

A. persuade
B. request
C. instruct
D. expect

单项选择题This subject is ______ than that one.

单项选择题The founder of metaphysical school is ______.

单项选择题We obey him, ______ we are afraid of him, ______ we honor and love him.

单项选择题William Sidney Porter, known as O. Henry, is most famous for ______.