question: this is a risky exercise.
Capitalize this past sentence correctly.
A: This is a risky exercise.

question: such cases are obviously much less often than once affected site.
Capitalize this past sentence correctly.
A: Such cases are obviously much less often than once affected site.

question: one couple tied their six children to trees so they could not follow them as they fled to find food.
Capitalize this past sentence correctly.
A: One couple tied their six children to trees so they could not follow them as they fled to find food.