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 ."
谜底详解：
1.While—When或After.本句的this指代的是to change the weather by using magic. when/after 指导时刻状语
2.in—than.earlier是early的斗劲级，厥后应有than
3.those之后加who.who指导定语从句
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做定语润色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.前提句
10. will—would.if指导的是前提句用的是remained一般曩昔时