请该出以下英语问题的答案及解析

题目

请该出以下英语问题的答案及解析
1,Never before that night ____ the extent of my own power.
A.had I felt B.I felt C.did I feel D.I had felt
2,Only under special circunstances____to take make-up tests.
A.are freshmen permitted B.freshmen are permitted
C.permitted are freshmen D.are permitted freshmen
3,The residerts ,____had been damaged by the flood ,were given help by the Red Cross.
A.all their homes B.all whose homes
C.all of whose homes D.all of their homes
4,Today,____major new products without conducting elaborate market research.
A.corporations hardly introduce ever B.corporations hardly ever introduce C.hardly corporations introduce ever D.hardly corporations ever introduce
5,Radio,television and press ____of conveying news and informtion.
A.are the most three common means B.are the three most common means C.are the most common three means D.are three the most common means
6,We have been told that under no circumstances____the telephone in the

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