【形容詞・副詞の解答】 
１．
　⑴   bigger	　　
　⑵　the  largest	
　⑶　prettier　	　
　⑷　later 
　⑸   earlier	　　
　⑹　better		
　⑺　more  useful　
　⑻　the  most  popular 
　⑼   more  beautiful	　　　　
　⑽　hotter		　
　⑾　the  most  difficult 

２．
　⑴ colder  than 
　⑵ smaller  than	　　　
       ＊　⑴・　⑵　not　as ･･･ as ～　「～ほど･･･でない」 
　⑶ shorter  than	　　　
       ＊　背が高い（tall）⇔ 背が低い（short） 
　⑷ best		　　　
       ＊　「他のどの季節より夏が好き」→「夏が一番好き」 


３．
　⑴  This  box  is  heavier  than  that  one（box）. 
　⑵  This  pencil  is  as  long  as  mine. 
　⑶  That  is  the  oldest  building  in  the  world. 
　⑷  I  like  dogs  better  than  cats. 
　⑸  My  mother  goes  to  bed（the）latest  in  my  family. 
　⑹  He  can't  swim  as  fast  as  I. 
　⑺  He  is  much  taller  than  his  father. 
        ＊　比較級を強めるのは much で「ずっと～である」の意味になる。 
　⑻  This  is  one  of  the  most  famous  schools  in  this  city. 
　⑼  Which  do  you  like（the）best  of  all  the  subjects? 
　⑽  Which  is  colder,  February  or  March? 
　⑾  This  tree  is  three  times  as  tall  as  that  one（tree）. 
        ＊　－times  as ～ as 「－倍の～」 

４．
　⑴  December  is  as  cold  as  January. 
　⑵  I  can  ski  as  well  as  Tom. 
　⑶  This  book  is  more  useful  than  that  one. 
　⑷  My  mother  can't  walk  as  fast  as  I. 
　⑸  Bikes  aren't  as  useful  as  cars. 
　⑹  He  comes  to  school （the）latest  in  our  class. 
　⑺  My  father  comes  home  much  earlier  than  I. 
　⑻  Can  you  swim  better  than  Bob? 
　⑼  That  is  one  of  the  oldest  schools  in  Japan. 
　⑽  She  is  the  happiest  girl  of  all  the  students. 
　⑾  Which  is  bigger,  the  sun  or  the  earth? 
　⑿  Which  is  the  largest  lake  of  the  three? 
　⒀  I  like  English  better  than  French. 
　⒁  This  train  is  the  most  famous  in  the  world. 
　⒂  Which  is  warmer,  May  or  June? 
　⒃  Which  do  you  like （the）best  of  all  the  flowers? 
　⒄  Is  radio  more  interesting  than  TV? 
　⒅  Who  goes  to  bed  （the）earliest  in  your  family? 
　⒆  Which  pencil  is  the  longest  of  the  five? 
　⒇  I  like  September （the）best  of  all  the  months.