在空格处填入合适的词完成这封信。

Hi, Lisa, 

      I can't wait to tell you this! I went to the Great Wall today! It is amazing! The Great Wall is about 2, 000

years old and it _____________ about 6, 000 kilometres long! I was really excited and _____________ many

pictures. I _____________ show you later. 

      And guess what? I _____________ by train! I met a girl, Lina, on the train. We talked all the way to the

Great Wall. She told me something about the railway. It is one of China's earliest railways! Isn't that interesting? 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Yours, Lydia