Question 25:
The growth in the economy makes people's living condition better.
The correct answer is D. The more the economy grows, the better people's living condition is.

Explanation: The original sentence implies a direct relationship between economic growth and people's living conditions. The comparative structure in choice D correctly reflects this cause-and-effect relationship with proper grammar and subject-verb agreement.

Question 26:
Try to work hard. Otherwise, you will fail the final exam.
The correct answer is A. Unless you try to work hard, you will fail the final exam.

Explanation: The sentence presents a condition (try to work hard) and a consequence (fail the final exam). "Unless" correctly expresses this condition.

Question 27:
He/read/book/his room/when/he/hear/big explosion.
The correct answer is C. He was reading books in his room when he heard a big explosion.

Explanation: The past continuous tense ("was reading") is used to describe an ongoing action in the past, while the past simple tense ("heard") is used for the completed action (the explosion). The preposition "in" is appropriate for the location.

Question 28:
I wish/have/ enough money/travel/ San Francisco.
The correct answer is B. I wish I had enough money to travel to San Francisco.