1.This book is __________hard___________ understand.

A too £¬too       B to£¬ to         C too£¬ to     

2.I used __________TV in the evening.

A to watch                 B watching                C watched                

3They are not ________to deal with such an accident .

 A serious enough        B enough serious         C too serious       

4.I don’t know ________to play this new game.

A what              B how                  C however