The answers are C, D and G.

Blank (i): "Burgeoning" accurately describes a continuously growing or expanding national debt.

Blank (ii): "Austerity" refers to a strict or disciplined economic policy aimed at reducing government spending or debt.

Blank (iii): "Curtail" means to reduce or restrict spending, aligning with the goal of the program aimed at addressing the national debt.

Therefore, the completion using "burgeoning," "austerity," and "curtail" effectively portrays the situation of the growing national debt and Congress's response with a strict program to reduce spending and address the issue.