英语作文 使我印象深刻的一件事

I went to the Great Wall with my friends last summer.It was a beautiful day.The sun was shining,the birds were singing.We walked on the wall for about two hours.We took lots of photos.Then we met a group of foreigners.They let us to help them take photos.We were really glad to help them.We also took photos with them and talked with them in English.We told them the history of the Great Wall.They were very surprised because we could speak English so well.We felt very happy that day.What an unforgetble exerience!