介词填空
behind next to in frontof

The gym is behind the science labs.
The library is________the classrooms.　 　　
The library is_________ the dining hall.
The classrooms are_________ the offices.    
The science labs are _________the gym.
The dining hall is_______the library.        
The offices are ________the science labs.
The classrooms are________the library.       　
The science labs are__________the offices.