Global warming caused by human being’s casual behaviour has become a major ______

Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.

#5589

conflict

concern

challenge

factor

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. You must be there within an hour. There should be no _______ in sending the information.

#6660

question

hesitation

delay

problem

You are working too hard. You'd better keep a ________ between work and relaxation.

#5741

promise　　

read　　

balance　　

diary

Mr. Smith thought of himself as _______,and this accident had ________ effect on his life.

#5212

a failure; a

failure; an

a failure; an

failure; the

The tomato juice left brown ____ on the front f my jacket．

#6890

spots

points

tracks

traces

Bill was doing a lot of physical exercise to build up his______.

#7151

ability

force

strength

mind

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