Directions: In the sentence, certain words are in bold and numbered from A to H, which are the possible pairs to be interchanged. Choose the pair(s) of the words that need(s) to be interchanged to make the sentence grammatically correct and meaningful.

a. The drafting committee(A) worked subjected(B) the night in a vain(C) attempt to finish on schedule(D).
b. He was through(E) to the most vicious(F) calumny, but he never(G) complained and never sued(H).