there is a variety of reasons为什么错的语法错误?

there ______ a variety of books用is还是are there is a variety of reasons为什么错的语法错误? There is a _____of ten pounds in weight.填variety还是variation?为什么呢？好像variety是种类的意思 there is/are a variety of rooms 这里用is 还是are 帮我看看这句话 用is 还是are?there is/are a variety of rooms . There is a wide variety of animals in the zoo.（同义句） There is a variety of dishes on the menu.or There are varieties of dishes on the menu.哪个正确? In American English, there exists a variety of English spoken by the African Americans, a variety that is different from the Standard American English(SAE). Can you specify the characteristics of this particular variety of English used by the African 关于there be 句型的就近原则有各种各样的书籍我认为是 there are a variety of books(但另一个人认为应该是 there is a variety of books因为就近原则 靠近a 所以用is)我认为 应该是there are a variety of books就 英语主谓一致问题.There are a variety of ways of forming healthy habits.这里是用there are 还是there is .为什么? a variety of 和 a lot of 的区别!There is _____ furniture in that old house,which was built in the 17th century.A.a variety ofB.a large number ofC.large numbers ofD.a lot of 英语：a variety variety 音标! There is a wide variety of animals in the zoo.(改为同意句)There are _____ ______ ______ animals in the zoo. 请问a variety of 可以修饰不可数名词吗?我看到教科书上有这么一句话：There is a wide variety of new music to be discovered in every corner of the world. 英语口语发音a wide variety of items variety of of的o音不发?variety of items 这三个应该连在一起吗? a variety of 和the variety of 的区别是什么,他们后面动词用单数还是复数?A variety of students is girls.A variety of students are girls.哪句话是对的? a great variety there is ____（a/an）“o” in this word.