By manipulating ___________ in the country, the Fed can influence the economy in a positive or negative way.

A．To tell him she has made all arrangements for him.
B．To farewell to him.
C．To give him thanks about his good arrangements.
D．To invite him to visit China.

A．Meeting with his professors.
B．Doing extra work in the chemistry lab.
C．Writing papers for his classes.
D．Working overtime as a librarian.