One of the most important lessons you should (28) __________ is when you drink, you shouldn't drive. I learned this the hard way.

Read the following passage and write the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 28 to 32.

One of the most important lessons you should (28) __________ is when you drink, you shouldn't drive. I learned this the hard way.