Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.
A．whenever B．however
C．whichever D．wherever
She usually keeps her valuables, such as jewels and money, ________ she believes secure.
A．even ifB．in case
C．whereD．that
How can they expect to learn anything ________ they never listen?
A.whetherB．when
C．butD．unless
—I wonder how much you charge for your services.
—The first two are free ________ the third costs $30.
A．while B．until
C．when D．before
—I think George doesn't really care for TV plays.
—Right, ________he still watches the program.
A.and B．but
C．or D．so
After the war, a new school building was put up ________ there had once been a theatre.
A.that B．where
C．which D．when
