Answer:
Fall;rise.
Decrease;selling.
Step-by-step explanation:
Suppose there is a rash of pickpocketing. As a result, people want to keep less cash on hand, decreasing the demand for money. Assume the Fed does not change the money supply. According to the theory of liquidity preference, the interest rate will fall, which causes aggregate demand to rise.
If instead the Fed wants to stabilize aggregate demand, it should decrease the money supply by selling government bonds.