46. I apologize if I _____ you, but I assure you it was unintentional.
A) offend
B) had offended
C) should have offended
D) might have offended

47. Although a teenager, Fred could resist _____ what to do and what not to do.
A) to be told
B) having been told
C) being told
D) to have been told

48. Greater efforts to increase agricultural production must be made if food shortage _____ avoided.
A) is to be
B) can be
C) will be
D) has been

49. Doing your homework is a sure way to improve your test scores, and this is especially true _____ it comes to classroom tests.
A) before
B) as
C) since
D) when

50. There are over 100 night schools in the city, making it possible for a professional to be reeducated no matter _____ he does.
A) how
B) where
C) what
D) when

46.B 47.C 48.A 49.D 50.C