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

A．It makes people mentally ill.
B．It hinders people's improvement.
C．It gives people too much stress.
D．It makes people successful.

A．Typing notes on computers is less effective.
B．Many college students prefer writing notes by hand.
C．Writing notes by hand is much better for long-term memory.
D．Computers may hurt students' academic performance.