A．Because they were forced to do so by the British government.
B．Because it best serves the needs of its native speakers.
C．Because it is the easiest language for internal and international communication.
D．Because with multilingual populations they need it for internal communication.

A．Because they’re quite impressive with a strong effect.
B．Because they are not so frustrating as other expressions.
C．Because they are practiced and repeated once and again.
D．Because they are most people’s favorite words.