单项选择题

When I went in, he was lying on the floor ______ at the ceiling.

A．to stare
B．stared
C．was staring
D．staring
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单项选择题
To read Tolstoy and ______ to nineteenth century Russian literature are two excellent reasons for taking Professor Morrel's Course.
A．to introduce
B．introduce
C．being introduced
D．to be introduced
单项选择题
The steam engine gives us an example of heat ______ into work.
A．turns
B．turned
C．turning
D．being turned
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