Paragraph Four Naturalization in the UK requires five years’ residence or three years if the applicant’s spouse is a Briton. Other conditions include good behavior and sound mind. Those who are not married to a Briton are also required to have a sufficient knowledge of English. They must also intend to have their main home in Britain.R______ for acquiring British citizenship.
【正确答案】：Rules
【题目解析】：整段都在讲规章制度，可以推断出答案。