Read the paragraph.(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.
Answer
A
Sentence 1 should be revised to change “is” to “are.”
B
Sentence 2 should be revised to change “will cost” to “costs.”
C
Sentence 3 should be revised to change “continue” to “continued.”
D
Sentence 4 should be revised to change “could help” to “helps.”