One day ,Mr.wang arrived in beijing for a visit .It was his first time travelling in beijing ,so he was very excited and happy .He wanted to go to the Great Wall to have a look,but he did not konw the way there.So he called a taxi to take him there.The taxi diver was very freindly and helpful,introducing him many scenic sites to visit in Beijing .When Mr.wang got off the taxi,he found his identity card missing ,he felt very worried and upset .However,to his surpurise ,that taxi driver found him and returned his identity card back.They became good friends at last .