To help avoid or ease vision problems when working at a computer ...

[Charlie]

To help avoid or ease vision problems when working at a computer
 
 a. make a conscious effort to blink often
  b. shift your gaze away from the screen from time to time
  c. take a break from looking at the screen at least once every two hours
  d. all the above

Question 2

VoIp is
 
 a. a service that transmits phone calls via the Internet
  b. a type of voice mail system
  c. more expensive than traditional phone service
  d. all the above

[mochi09]

Answer to Question 1

D

Answer to Question 2

A