Direction: In the sentences, 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. My son is always unwilling(A) to practise(B) upon the piano as pull(C) as he should have done(D).
b. All Angus did was regularly(E) his robe tighter around(F) him and slump(G) in one of the high-backed chairs to glower(H) at us.