A. so easy as  
B. as difficult as  
C. much difficult than    
D. less easier than

1. Dave is____( tall) than Kelly.
2. Kelly is an extrovert. She is                  ( outgoing) thanLucy.
3. The Yellow River is the second____( long) river inChina.
4. Saying a thing is very                   (与……不同 ) doing it.
5. The color of her hair is                            (同......一样)  her mother's.

He is ______            _ go there alone.

1.Over three-fourths of the gas is nitrogen.（改为同义句）
                        three-fourths of the gas is nitrogen.  
2. Everything will die on the earth without the atmosphere to protect us.（改为同义句）
    Nothing could ________on the earth without the atmosphere to protect us.
3. The chorus（合唱队）of our school consisted of some students and teachers.（改为同义句）
    The chorus of our school_______       some students and teachers.
4. The river is filling with heavily rain.（改为同义句）  
    The river ________of heavily rain.
5. I found that studying English well is more difficult.（改为同义句）  
    I found        ____more difficult____       English well.

A. too; to  
B. so; that  
C. as; as  
D. both; and

A. not; until                                
B. too; to
C. so; that                                
D. not only; but also