The richest agricultural region of America is ______.

单项选择题The United Kingdom is a ______ monarchy.

单项选择题John Milton was a great ______ in English literary history.

单项选择题Which of the following expressions manifest the directive function of language

单项选择题Pygmalion is a play by ______.

单项选择题The study of the way speech sounds are made by the vocal organs belongs to ______.