A． History.
B． Chemistry.
C． Astronomy.
D． Mathematics.

A． She had her vacation there.
B． She took a diving course there.
C． She was there on a field trip.
D． She visited a marine exhibition.

A． I have to review French.
B． I have studied French for five years in Paris.
C． I have to discuss with some French people from Paris.
D． I can meet a Polish during the negotiation in Paris.