40. Once harm ______ to the environment, it takes years to have the system recovered.

A. does　　　　　　　　　 B. is done　　　　　　　 　 C. will be done　 　 　　D. be done

39. Staying in a hotel in Shanghai one day costs ____ renting a house in my hometown for a week.

A. the three times price of　　 　　　　　 　B. three times the price of

C. as much as three times　　 　　　　　　　　　　 　D. as much three times as

38. Ted and his friends established a website offering useful information about thunderstorms ______ similar accidents happening.

A. prevent　　　　　　　　　　 B. preventing　　　　 　 C. to prevent 　　　　　 　D. prevented

37. I don’t understand how you got a ticket. I always 　　　　　you 　　　　a careful driver.

A. think; are　　　　　　 B. am thinking 　　　　 C. thought; were 　　　　 D. think; were

36. ______, a small advertisement held my attention, which read “Easy job. Good wages. No experience necessary.”

A. Looking through the newspaper　　　　 　 B. While I was looking through the newspaper

　 C. To look through the newspaper　 　　　D. I was looking through the newspaper