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(2013·威海两校模拟)________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
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A
Having believed
B
Believing
C
Believed
D
To believe
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Having taken our seats, ______.
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A
the professor began the lecture
B
the lecture began in no time
C
we were attracted by the lecture immediately
D
the bell announced the beginning of the lecture
There was a sudden burst of light          a terrible noise.
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A
following
B
to follow
C
followed
D
followed by
Having taken our seats,_______________________.
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A
the professor began the lecture
B
the lecture began soon
C
we were attracted by the lecture soon
D
the bell announced the beginning of the lecture
Saying always has less difficulty than _____.
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A
done
B
doing
C
to do
D
having done
---Where are you, Tom? ---Here in the sitting room, ___to Professor Smith.
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A
to write
B
writing
C
is writing
D
to be writing