A．Everyone should admit that they have enemies.
B．Humble people have fewer enemies.
C．It is terrible to have enemies.
D．Generous people have no enemies.

A．People are born with them.
B．They are invalid.
C．People cannot get rid of them.
D．They can destroy people's ambitions.

A．Fear.
B．Worry.
C．Doubt.
D．Overcaution.