The leader of the House of Lords in Britain is ______.

单项选择题Fossilization is an important characteristic of the ______.

单项选择题The Republic of Ireland became independent in the year of ______.

单项选择题The study of language as a whole is often called ______.

单项选择题______ is a popular literary form in the Britain medieval period.

单项选择题Of monthly magazines, ______ has the highest circulation.