What are the A's and B's? Are the A's example answers given in your book, and the B's blanks that you have to fill in with another way to answer?
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hanuman_2000A. The step was not taken frequently.That's possible, but I think often is more natural than frequently.
hanuman_2000A.There is no mother but loves her child.That does not sound very natural to me. I'd go for There isn't a mother anywhere who doesn't love her child.
hanuman_2000The step was taken but rarely.
hanuman_2000There is no mother but loves her child.This usage of "but" is formal or literary, and can sound old-fashioned. It will work in some cases, but if you try to use it to create conversational sentences then they will probably sound weird.
hanuman_2000The #2 is an example in my bookJust out of curiosity, what is the date of publication of the first edition of this book?