1. Vanity of vanities; all is vanity. 
   空幻的空幻；一手皆空。
2. To form by hollowing out. 
   挖空挖空成某种形状
3. An unoccupied telephone booth. 
   一个空的电话亭
4. command of the air 
   制空权
5. Fill in the blanks. 
   填空。

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