Donald was not very good at maths. He could not understand the teacher’s   16  . Even when the teacher explained something again, Donald still could not   17  it. “Never mind,” Donald told himself. “I’m quite good at other  18  . I cheat（作弊） in the maths exam, then I won’t be in   19  .”

“My deskmate Brian Smith is best at maths,” he thought, “and I’ll be able to   20   his answers.”

The day of the exam came, and Donald sat   21   Brian Smith, who always sat at the top of the   22  . Donald carefully copied Brian's answers onto his own exam paper. At the end of the exam, the teacher   23   the papers and graded（评分）them.

Then she said, “Well, boys and girls, I’ve decided to give a   24   to the student who got the highest grade. It’s   25   for me to decide whom I will choose, however, because two students, Donald and Brian, got the   26   grade.”

“Let them share it.” one of the   27   said.

“I’ve thought about that,” the teacher said, “but I've chosen Brian.”

Donald was   28   when he heard this. He stood up and said, “That’s not fair.”

“That’s   29  ,” the teacher said. “However, Brian’s answer to Question 18 was ‘I don’t know.’ Yours was ‘  30   do I.’”

16. A. examination            B. explanation        C. decision            D. spelling

17. A. understand             B. know                      C. hear                 D. listen to

18. A. sports                    B. ways                C. subjects           D. kinds

19. A. surprise                 B. hurry                C. tears             D. trouble

20. A. write down            B. copy                C. put on              D. look for

21. A. next to                   B. in front of         C. behind              D. far from

22. A. group                    B. row                  C. family              D. class

23. A. threw                    B. hid                   C. collected        D. sold

24. A. job                    B. worry             C. beat                 D. prize

25. A. difficult             B. impossible          C. possible            D. easy

26. A. different            B. same                  C. strange             D. interesting

27. A. teachers             B. players               C. students           D. assistants

28. A. angry                B. excited               C. sad                  D. happy

29. A. clever                B. rough                 C. true                  D. wrong

30. A. Either                B. Neither               C. Any                  D. So