合并句子.（定语从句）
问题描述：
合并句子.（定语从句）
1.the book is written by Jk Rwling .It is well worth reading.
2.A plane is a machine .The machine can fly.
3.The school is far away .We visited it yesterday.
答
1.The book is well worth reading that is written by Jk Rwling .
2.A plane is a machine that can fly.
3.The school is far away that we visited yesterday.为什么不是which呢"That"是通用的，在以上句子里也可以用which替代