Once a policeman took a thief(贼) from a small town. On the w , they saw a shop. The thief said to the policeman, “Let me go into the shop to buy s  and we can eat on the train.” The policeman said “Yes!” and stood outside the shop. Ten minutes l_ , the thief still didn’t go out. The policeman went into the s. He found the thief ran a  through the back door. Then all the policemen had to s__   the town for the thief again. They caught him soon. They asked the  s  __ policeman to take the thief to the city again. Once more, they passed a shop. The thief said he was thirsty(渴了) and wanted to buy some w . But the policeman said: “ You’re going to run away a . Right? Are you taking me as a fool(傻瓜)? This time I’ll go and get some water for you. You must w right here. OK?”