1,Is this () book you were talking about yesterday?A a,B an

1,Is this () book you were talking about yesterday?A a,B an C the,D /(为什么不是选D?） 2,How strange!These years my birthday always falls ().A on the Sunday.B on a Subday.C on Sunday.D at a Sunday,(为什么不是选C) 3.The market for () used computers is getting larger and larger as () years go on.A / /.B the /.C the.the D / the(为什么不是选A) 4.The teacher asked the boy many questions,but he only answered () of them.A some.B few(为什么不是选B) 5.Do you know () this book belongs to?A whose B who(为什么不是选A) 6.我每天早上都有跑步的习惯Running in morning is my habit..（能不能这样翻译） 7.我和我姐姐在兴趣方面不一样.I and my sister has different hobbies