Ancient man attempted to change the weather by using magic. While experience taught him this was impossible, __1__
　　he tried to forecast weather conditions. Even earlier in __2__
　　1000 B.C. there were weather seers in Babylon----and priests clever enough to denounce as frauds those predicted __3__
　　the weather a year in the advance. Some forecasters used __4__
　　methods that seemed to take no connection with the actual __5__
　　factors controlled the weather. Chickens and other animals __6__
　　were sacrificed and their intestines poked to find signs indicating rain and drought. Somewhat more scientific were __7__
　　predictions based on vegetation:"Onion’s skin very thin ,mild weather coming in. Onion’s skin thick and tough, coming weather is cold and rough."
　　Insects and animals were also __8__
　　favorite weather clues: "Before the glowworm lights his __9__
　　lamp , then the air is always damp ." "If spiders their cobwebs forsake , the weather will for certain break." "If frogs remained in pools , the weather will be fine . If they were seen on rocks, __10__
　　rain and cold were due." It’s difficult to say whether this rhyme should be taken seriously : " Hark , I hear the asses bray . Me thinks we’ll have some rain today ."
　　答案详解：
　　1.While—When或After.本句的this指代的是to change the weather by using magic. when/after 引导时间状语
　　2.in—than.earlier是early的比较级，其后应有than
　　3.those之后加who.who引导定语从句
　　4. 删除advance前的the.in advance为习语
　　5. take—have.have connection with 为习语
　　6. controlled—controlling或在controlled前加that/which.controlling the weather 或that/which controlled the weather做定语修饰the actual factors
　　7. and—or.rain和draught只能是二者之一
　　8. 删除is.与上文平衡，均为省略句
　　9. before—when/if.条件句
　　10. will—would.if引导的是条件句用的是remained一般过去时

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