【C14】A．challengeB．taskC．resultD．mistake

A．produceB．leadC．resultD．act

【C20】A．factB．caseC．resultD．contrast

A．BecauseB．Because ofC．As a resultD．Considering

【C18】A．finishB．closeC．resultD．end

______, it was completed on time.A．Difficult as the task wasB．Difficult as was the taskC．A

A．problemB．causeC．resultD．resource