Directions: This question presents a sentence, all or part of which is underlined. Beneath the sentence you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

Not till a baby kangaroo is four month old, does it begin to live outside its mother's pouch.

Not till a baby kangaroo is four month old, does it begin to live outside its mother's pouch.

Not till a baby kangaroo is four month old, it begins to live outside its mother's pouch.

Not until a baby kangaroo is four month old, does it begin to live outside its mother's pouch.

Not till a baby kangaroo is four months old, does it begin to live outside its mother's pouch.

Not until a baby kangaroo is four month old, it begins living outside its mother's pouch.