单项选择题

Only ______ according to the directions can the medicine be quite effective.

A．taking
B．taken
C．being taken
D．having been taken
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单项选择题
The final examination is coming up soon. It's time for us to ______ our studies.
A．get down to
B．get out
C．get back for
D．get over
单项选择题
Reading is an experience quite different from watching TV; there are pictures ______ in your mind instead of before your eyes.
A．to form
B．form
C．forming
D．having formed
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