．You should take __________ measures to avoid danger when doing exercise.

—What do you think of the play?—Terrible! I’ve never seen _________ one. 

When someone is hungry, he won’t be _______ about what he eats.

I can’t go _____ because I have to go home at once. 

 --Our women athletes achieved great success in tile 2012 London Olympic Games.--Yes. No one else could perform ________, I think.