改错题。句子中有一处是有错误的，把它找出来并改正。

①There are many people are playing basketball there.____ 
②Could you tell me the different between the two books.____ 
③It was my grandpa's eighty birthday yesterday._____ 
④Bady,it's very lazy for you to sleep late every morning.____ 
⑤I wrote an 800-word's composition yesterday.____ 
⑥The fish we caught is still living.____ 
⑦The Great Wall is one of the most famous building all over the world.____ 
⑧If Tom will study hard this term,he will catch up with his classmates.____ 

已知a=${\log }_{\frac{1}{3}}\frac{1}{2}$，b=${\log }_{\frac{1}{2}}\frac{1}{3}$，c=sin$\frac{1}{2}$，则（　　）

自东十二区进入西十二区，时刻和日期的变化为（　　）