40．Once harm ______ to the environment, it takes years to have the sy stem 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 informatio n 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

35．______ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal．

　　　　 A．When　　　 　　 B．As　 　 C．While　 　　 D．Before