"Young" people are often "boring" with doing the same things every day. The correct answer is B. (are) -> (get)

All "his" brothers work in the "biggest" companies of the country. The correct answer is B. (works) -> (work)

While we were walking in the "park," we saw some beautiful flowers. The sentence is correct as it is.

He asked what we could do to support the elderly and the disabled children. The correct answer is A. (could we) -> (what we could do)

We didn't have enough time to finish the project before the deadline. The correct answer is B. (time enough) -> (enough time)