完形填空You have often __16__ people talk about work.Perhaps you

完形填空You have often __16__ people talk about work.Perhaps you have __17__ your friends
about how hard you worked to get something done.However,you may have done no work __18__ you think you worked hard.
A boy is pushing a big box very hard,but the box is __19__ heavy for him to move and he may __20__ to push against the box.__21__ the language of science,he has not done __22__ work.Can you think you are working when you are studying or talking?
In science,work is only done when a force(力) moves something that has weight through a distance（距离）.
Work = force × distance moved.
__23__ you want to find out whether work is done,__24__ yourself,“Is a push or a pull moving something through a distance?” If your answer is __25__,then work is being done.
（ ）16.A.asked B.wanted C.listened D.heard
（ ）17.A.said B.told C.talked D.spoken
（ ）18.A.though B.so that C.while D.because
（ ）19.A.very B.so C.too D.such
（ ）20.A.be afraid B.be sure C.not like D.like
（ ）21.A.In B.With C.As D.For
（ ）22.A.a B.no C.some D.any
（ ）23.A.If B.After C.While D.As soon as
（ ）24.A.to ask B.just ask C.only think D.to think
（ ）25.A.“Right” B.“Good” C.“Well” D.“Yes”