Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of thefollowing questions from 13 to 17.

a. Alex: Why online classes?
b. Sue: I'm going to try online classes.
c. Alex: How are you going to improve your English?
d. Alex: I think online classes are too expensive. I don't think I'll try them.
e. Sue: They improve our communication skills, and they have flexible schedules.