How long do you want me to heat the oil? — Heat it till it _____to smoke.

er to keep the balance of ecosystem, everypossible means _______to deal with the problems of the over-exploiting ofnatural resources.

eated in a chair and lost in thought, gave me a sudden look, as if_______ ,“Are you kidding”

the recent river pollution in several provinces,people _______ more and more attention to the quality and safety of drinkingwater

Lisa was angry with Joe because she couldn’t _____ his disrespect to the kind man who had helped them out.