16. We were struck by the extent ________ which teachers‘ decisions served the interests of the school rather than those of the students.

　　A) to B) for C) in D) with

　　17. Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ________.

　　A) intention B) attempt C) purpose D) desire

　　18. The store had to ________ a number of clerks because sales were down.

　　A) lay out B) lay off C) lay aside D) lay down

　　19. All the students in this class passed the English exam ________ the exception of Li Ming.

　　A) on B) in C) for D) with

　　20. Writing is a slow process， requiring ________ thought， time， and effort.

　　A) significant B) considerable C) enormous D) numerous

　　6-20 ABBDB

　　21. Lightning is a ____ of electrical current from a cloud to the ground or from one cloud to another.

　　A) rush B) rainbow C) rack D) ribbon

　　22. New York ____ second in the production of apples， producing 850，000，000 pounds this year.

　　A) ranked B) occupied C) arranged D) classified

　　23. By success I don‘t mean ________ usually thought of when that word is used.

　　A) what is B) that we C) as you D) all is

　　24. I caught a ________ of the taxi before it disappeared around the corner of the street.

　　A) vision B) glimpse C) look D) scene

　　25. Students or teachers can participate in excursions to lovely beaches around the island at regular ________.

　　A) gaps B) rate C) length D) intervals

　　21-25 AAABD

　　26. Physics is ________ to the science which was called natural philosophy in history.

　　A) alike B) equivalent C) likely D) uniform

　　27. The new appointment of our president ________ from the very beginning of next semester.

　　A) takes effect B) takes part C) takes place D) takes turns

　　28. The president made a ________ speech at the opening ceremony of the sports meeting， which encouraged the sportsmen greatly.

　　A) vigorous B) tedious C) flat D) harsh

　　29. It is useful to be able to predict the extent ________ which a price change will affect supply and demand.

　　A) from B) with C) to D) for

　　30. Finding a job in such a big company has always been ________ his wildest dreams.

　　A) under B) over C) above D) beyond

　　26-30 BAACD