1. 用所给单词的适当形式填空

1. （1） Mr. Liu is one of (popular) teachers in our school.  
   

3. （2） Our school is much (beautiful) than yours.  
   

5. （3） Who is (young) of the twins.

7. （4） Jim works as (hard) as Tom.

9. （5） The higher the mountain is , the (thin) the air is. 

11. （6） If you can answer all the questions (correct) ,you will get a gift from the host.

13. （7） He didn't want to go to school by pretending to be(terrible) ill.
    

15. （8） Millie tried her best but did (bad) among all the members in the team.
    

17. （9） It's reported that the haze(雾霾) in February, 2014 is the (serious) one these years in China.
    

19. （10） Lucy is one of the (tall) girls in our class.