Ireland is called the Emerald Isle for its rich green countryside, but politically it is divided into two parts: ______.

单项选择题Hawthorne generally concerned himself with such issues as ______ in his fictions.

单项选择题All his novels reveal that, as time went on, Mark Twain became increasingly ______.

单项选择题The Wars of Roses was ended by ______ who destroyed the forces of the two sides of the wars, and the feudal basis of society was completely broken.

单项选择题Most embedded clauses require an introductory word called a subordinator, such as that, until, before, ______, and so on.

单项选择题Lead(metal) and lead(dog's head) are spelt in the same way, but pronounced differently. This kind of sense relation is called ______.