Kimi and Mike are best friends. They spent their summer holiday. 1 in Africa. When they were walking through the desert, they started to argue about something. Kimi became very 2 and hit Mike on the face. Mike felt hurt, 3he didn't say anything to Kimi. Then Mike wrote in the sand, "Today my best friend hit me on the face."
They went on walking until they 4 a small lake. They decided to 5. But when Mike got into the water, he started to sink(下沉). Kimi jumped in after him and pulled him out. His friend 6 his life. After he became 7 again, Mike wrote on a stone, "Today my best friend saved my life."
Kimi couldn't 8 it. "After I hurt you, you wrote in sand. Now you write on a stone. Why?" he asked. "When someone hurts us, we should write 9 down in sand and the wind will take it away," Mike answered. "But when someone does something good 10us, we must write it on a stone so that no one can take it away."
