Question

Fortunately, the little one survived the fall
Beginning with it was

Answer 1

it was fortunate for the little ones to survive the fall

Answer 2

Heya,
Here is your answer.
》》》》》》》》》

Given sentence,
Fortunately, the little one survived the fall.

Sentence change (begin with 'it was') : It was fortunate that the little one survived the fall.

Hope it helps.