________is known to us all that the old scientist, for _____..

________is known to us all that the old scientist, for ____________life was hard in the past, still works hard in his eighties.[ ]A. It ; whomB. As ; whom C. As; whose D. What; whom

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As the busiest woman in Norton, she made ____ herduty to loo..

As the busiest woman in Norton, she made ____ herduty to look after all the other people's affairsin that town.[ ]A. thisB. that C. oneD. it

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He didn't make ________ clear when and where the meeting wo..

He didn't make ________ clear when and where the meeting would be held.[]A.this B.that C.it D.these

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Everyone knows _____ is dangerous to play with fire, but ___..

Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children from playing with fire. [ ]A. that; it B. it; it C. that; what D. it; what

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— How I wish I had watched the football match last night.— ..

— How I wish I had watched the football match last night.— ________, today's examination would be a total disaster. [ ]A. When necessaryB. If soC. If possibleD. So what

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