4. each, every, either, some, any, no，由以上六个词中任何一个所构成的复合代词作主语时；
some经常构成的三个复合代词：something, somebody, someone；
no经常构成的三个复合代词：nothing, nobody, no one； either of + 短语；
2> and连接的两部分被no, each, every中任何一个词修饰时；
例如：每位男士和女士都要着装得体。 be supposed to do sth. 理应，应该做某事。
Every man and every woman is supposed to dress properly.
11. Many an airplane _B_ in the exhibition.
A are shown B has been shown C has shown D show them
many a(an) 很多，相当于many； many a(an) + 可数名词单数，做主语时谓语动词用单数。
6. many a (an) + 可数名词单数，作主语时谓语动词用单数。
9. Not only Joan but her sisters _B_ the combination to the safe which contains the list of the family securities.
A have known B know C knows D is knowing
not only … but also … 的一种变形形式，not only … but …
另一种变形形式not only … but … as well
combination n. 密码； combination to the safe 保险箱密码； securities有价证券。
Provide a Better Life for Senior Citizens Now we have a growing population of senior citizens. To ensure happy lives for them has become a focus of attention. Our traditiona
Passage Twenty-five (Exploration of the Titanic) After resting on the ocean floor, split asunder and rusting, for nearly three-quarters of a century, a great ship seemed to