Seat occupation has become a common phenomenon in your university. The library management

A. be a violent process.
B. take the world by surprise.
C. make the world different.
D. happen unnoticed.

A. why
B. what
C. how
D. which

A. pass
B. permit
C. allow
D. forbid

A. discarding
B. distressing
C. dissolving
D. disturbing