41. If you are required to do some work, it must be done _____.

A. sooner or later

B. after all others

C. at last

D. in the long run

42. If you know what the trouble is, why you don’t help them to _____ the situation?

A. simplify

B. modify

C. verify

D. rectify

43. I’m sorry, but what he thinks is not of the _____ important to me.

A. worthy

B. valuable

C. valueless

D. priceless

44. I’m sure your suggestion will _____ the problem.

A. contribute to solving

B. be contributed to solve

C. contribute to solve

D. be contributed to solving

45. I’m very much obliged to you _____ the information.

A. on

B. for

C. with

D. of