40. Which of the news story does this passage belong to? (A)Science & Technology (B)Art & Culture (C)Education (D)Health & Medicine

23. (A) I had just finished washing my car when it started raining. (B) When I had finished in the bathroom, I noticed that the toilet tank was empty. (C) After I locked the door, I had realized that my keys were inside the office. (D) Professor Brown usually returned the students’ papers as soon as he had finished grading them.