(1) The concerns about sending people to Mars is definitely worth considering. (2) For one thing, the mission will cost billions of dollars. (3) This would be a huge additional cost at a time when national debts continue to skyrocket. (4) Also, that money could help fix problems here on Earth. Which sentence needs revision to fix a grammar error?

Sentence 1 should be revised to change “is” to “are.”
Sentence 2 should be revised to change “will cost” to “costs.”
Sentence 3 should be revised to change “continue” to “continued.”
Sentence 4 should be revised to change “could help” to “helps.”

I think sentence 4 should be revised to change "could help " to " helps"

what makes a hero is someone who tries and acres and then heps to save people

the correct answer is a "it describes nora and mrs. linde's relationship". opcions b and d are not related to the content of the passage in any way. option c could be appropiate but it does not fully capture the effect of the dialogue, while option a is quite appropiate, since the dialogue not only exemplifies the relationship between the characters, but it also captures the effect in the excerpt. we get to know that mrs linde bosses around and already knows nora.