Fill in the blanks to make the following statements correct.

a. The government's budget constraint shows that government expenditures must be equal to the sum of ________ and ___________.

b. The government's annual budget deficit is the excess of total _______ over total _______ in a given year.

c. If the government's total budget deficit is \(\$ 20 \) billion and its debt-service payments are \(\$ 18 \) billion,

then its _________ is \(\$ 2 \) billion. If the total budget deficit is \(\$ 20 \) billion and its debt-service payments are \(\$ 26 \) billion, then its ________ is \(\$ 6 \) billion.