阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

No one is sure how many Americans belong to reading groups called book clubs.Yet【小题1】(publisher) and bookstores report that more and more people throughout the United States are joining【小题2】(they)．

Most of the clubs work the same way.Members read the same book at the same time.Then they meet to talk about the book.Members may be friends or people【小题3】live near each other.Some Americans belong to reading groups on【小题4】Internet.These groups include people around the world who communicate about books they read.They send electronic mails instead of gathering【小题5】(discuss) books.

Most reading groups study books by【小题6】(variety) writers.However，some groups read the work of a single writer，【小题7】(usual) one that has been famous for a while.Other groups may【小题8】(name) after an important person in the work of the writer，【小题9】a Sherlock Holmes Club.Members of these book clubs often are experts about their【小题10】(choose) reading materials.One member of a Holmes reading group，for example，can identify almost every person in every Sherlock Holmes story.