Last Sunday. Li Lei went to a mountain with many books. What a nice day! The sun was shining brightly. The bird was singing. Li Lei walked on the top of the mountain. There was beautiful grass. He sat down and began to read one of the books there. He read very carefully. Li Lei liked reading. His hobby was reading. He said that the books gave him knowledge and made him happy. Half an hour later, Li Lei finished reading the first book. He felt very happy. But when he wanted to read a second bo...