阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
The Great Wall is known(1)_________the eighth wonder of the world. Every year thousands(2)___________ tourists from all over the world come to visit this place of interest in China.
Last Saturday I went to the Great Wall with some of my friends. It was a sunny day. On our way up, we saw many volunteers keeping order in the sun. They helped the elders with their bags,(3)_________ photos for some tourists and answered people’s questions.Though they were very tired, they didn't stop to have a rest. We were(4)________(deep) moved when we saw this.Just at the moment, we saw a little boy standing alone and crying. We went over and asked
what happened(5)_________ him. From his answer we knew that he couldn't find his mother. We told him not to (6)_________about it and then we tried to get in touch with his mother with the phone number he gave us.Twenty minutes (7)________(late), his mother turned up.When she saw her son, she was very excited and thanked (8)_________with tears in her eyes.
That day we not only enjoyed the beauty of the Great Wall, (9)_________also felt the warmth of the society. (10)________everyone can reach out a helping hand to others, the world around us will be more and more harmonious (和谐的).