—Please don't tell anybody.
—I ________. I promise.
A．can't B．don't
C．won't D．mustn't
—Nowadays children have more freedom.
—I agree. They ________ do what they like.
A．need B．must
C．should D．can
As a considerate secretary, she never fails to know what ________ in her daily routine.
A．to expect B．expected
C．expects D．to be expecting
________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A．Having believed B．Believing
C．Believed D．To believe
No matter how frequently ________， the works of Beethoven still attract people all over the world.
A．performed B．performing
C．to be performed D．being performed
________ away from school for two weeks, I have quite a few lessons to catch up with.
A．Having been B．To be
C．Been D．Being
