Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours. 

-- Mike spends a lot of his spare time on computer games.--- So does my son. The children have become hopelessly ________the games.

John once worked in a remote mountain village school, which is _____ only on foot.

Einstein’s Theory of Relativity is so________ that most of us can not understand it.

 In fact she was _____ of softball, tennis and track.