after student in the order the questions had appeared on our homework sheets. She would start either at the front or the back of the classroom and walk toward the other end.

　　Since I was seated near the middle of about 35 students, it was easy to figure out which questions I might have to answer. This particular time, I had completed my usual two or three problems according to my calculations.

　　What I failed to expect was that several students were absent, which threw off my estimate. As Mrs. Totten made her way from the beginning of the class，I desperately tried to determine which math problem I would get. I tried to work it out before she got to me, but I had brain freeze and couldn't function.

　　When Mrs. Totten reached my desk，she asked what answer I'd got for problem No. 14. "I...I didn't get anything," I answered，and my face felt warm.

　　"Correct," she said.

　　It turned out that the correct answer was zero.

　　What did I learn that day? First, always do all your homework. Second, in real life it isn't always what you say but how you say it that matters. Third，I would never make it as a mathematician.

　　If I could choose one school day that taught me the most, it would be that one.

1. What does the underlined part in Paragraph 1 indicate?

A. It is wise to value one's time.

B. It is important to make an effort

C. It is right to stick to one's belief.

D. It is enough to do the necessary.

2. Usually, Mrs. Totten asked her students to _______.

A. recite their homework together

B. grade their homework themselves

C. answer their homework questions orally

D. check the answers to their homework questions

3. The author could work out which questions to answer since the teacher always _______.

A. asked questions in a regular way

B. walked up and down when asking questions