A man walked in the desert（沙漠）for two days. He 1 a sand storm during the trip. After the sand storm, he lost the sense of 2 . While he was unable to hold on, he suddenly found a small old house. He pulled his 3 body into the house. There was only some wood inside. He walked to the corner hopelessly, but suddenly 4 a water pump.
Excitedly, he went to draw water（抽水）, 5 he couldn't pump water no matter how hard he tried. He sat on the ground 6 . Just at that time, he saw a small bottle with a cork（瓶塞）. There was a yellow 7 posted on the bottle, which read, "You must put the water into the pump before you can draw water! Don't 8 , before you leave, refill it with water!" He pulled the cork and found the bottle was really filled with water! He could hardly believe his 9 .
At this moment, he thought, "If I only think about myself, as long as I drink the water in the bottle, I can be 10 to go out of this desert! If I do as the note told to put the only water into the pump and the water can't come back, I will be 11 to death. Will I take the risk or not?"
Finally, he made a 12 to do what the note told him and began to draw water with his shaking hands. Sure enough, the water really 13 !
After he drank enough water, he filled the bottle with water. He enveloped（封住）it with the cork and 14 his words after the note, "Believe me, it's really 15 . You should learn to pay before you get it!"
