Directions: In the following question, two statements are given with some words in bold. Which of the following pairs of bold words must be interchanged to make both sentences grammatically correct?

a. The trick(A) couple cried tears of regret(B) when their lights were shut off after gambling their rival(C) money away.
b. A irresponsible(D) move allowed the wrestler to pin(E) his utility(F) to the ground and defeat him once and for all.