A．For the sake of their health.
B．For the maintenance of the heating or the air-condition.
C．To make best use of their resources.
D．To make full use of the heating or the air-condition.

A．The woman should have watched the volleyball match.
B．He didn’t watch the volleyball match either.
C．He wasn’t pleased with the result of the volleyball match.
D．He wasn’t able to anticipate the result of the volleyball match.