Four parts have been underlined and lettered A, B, C, and D. One contains an error. 

1. Some students (A) at the back of the class were not attentive. They (B) did something else (C) instead of listening the lecture. They were (D) in trouble later.

2. From a watch shop (A) in North Bridge Road, (B) a honest European bought (C) a conventional watch (D) at a very high price.

3. I’m enclosing (A) a 500-dollars check in payment of the books (B) ordered. Please (C) acknowledge receipt (D) at your earliest convenience.

4. There was a flood last month. Some people climbed up (A) the house’s roof. They were not (B) in danger. But, (C) as bad luck would have it, a few old men (D) were drowned.

5. X: (A) What did you do now, John?
Y: I’m (B) doing some homework. The teacher wants to see (C) it (D) sometime tomorrow.

6. X: (A) Do you know what Paul Li is, Robert?
Y: (B) He is Assistant Manager of Eastern Co last year, but (C) is now (D) Manager of Far East Co.

7. X: Some of the students (A) talked in class when the teacher (B) walked in.
Y: Did the teacher (C) scold them or (D) pay no attention at all?

8. X: What time did you (A) go to school (B) in this morning?
Y: I went (C) there at half past seven. I was (D) in time for the first lesson.