题目内容：

阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

The professor stood before his class of 30 senior biology students，about to pass out the final exam．“I have been privileged to be your ________ this semester，and I know how hard you have all worked to________ for this test．I also know most of you are________ to medical school next fall，”he said to them．

“I am well aware of how much________ you are under to keep your GPAs up，and because I know you are all ________of understanding this material，I am prepared to ________ an automatic B to anyone who would ________ not to take the final．”

The relief was audible(听得见的)as a number of students jumped up to ________ the professor and departed from class．The professor looked at the handful of students who ________ ，and offered again，“Any other takers? This is your last ________．”One more student decided to________ ．

Seven students remained．The professor closed the door and took attendance．Then he 52 the final exam．There were two sentences typed on the ________ ：

“________ ，you have just received an A in this class．Keep believing in yourself．”

I ________ had a professor who gave a test like that．It may seem like the easy ________ of grading exams，but it’s a________that any teacher in any discipline(治学严谨)could and should give．Students who don’t have ________ in what they’ve learned are B students at best．

The same is________ for students of real life．The A students are those who believe in what they’re doing ________ they’ve learned from both successes and failures．

1.A．instructor     B．colleague     C．relative   D．principal

2.A．1ook          B．prepare       C．call       D．send

3.A．over           B．off          C．out        D．back

4.A．control        B．threat       C．pressure    D．guidance

5.A．fond           B．afraid        C．capable     D．worthy

6.A．report         B．suggest       C．introduce   D．offer

7.A．pretend        B．deserve      C．happen    D．prefer

8.A．thank         B．scold         C．punish      D．amuse

9.A．stopped        B．remained     C．gathered   D．succeeded

10.A．opportunity   B．effort        C．goal        D．lesson

11.A．flee          B．vote          C．go          D．exist

12.A．handed out    B．put down    C．set aside   D．picked up

13.A．desk          B．computer    C．paper      D．blackboard

14.A．Cheers       B．Thanks        C．Heavens     D．Congratulations

15.A．often         B．once         C．never     D．ever

16.A．cause         B．way           C．design      D．structure

17.A．help         B．mark         C．test       D．reward

18.A．energy       B．interest    C．patience   D．confidence

19.A．potential     B．true          C．impossible  D．wrong

20.A．because      B．although    C．when        D．unless