The first textbooks _______ for teaching English as a foreign language came out in the 16th century.
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A
having written
B
to be written
C
being written
D
written
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With a lot of difficult problems _______, the newly-elected president is having a hard time.
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A
settled
B
setting
C
to settle
D
being settled
Paper books still play an important role in the US textbook market, with digital textbooks __________ less than 5 percent of the total.
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A
composing of
B
making up
C
consisted of
D
accounted for
The professor paused as if ___________ his students to ask questions on the point he had just made.
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A
expecting
B
is expecting
C
expected
D
to have expected
It is reported that the bridge ______ last year has been damaged in a terrible flood.
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A
having been completed
B
to be completed
C
completing
D
completed
We usually take turns ______cleaning ,and today it is my turn ____it
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A
to do; doing
B
doing; doing
C
doing ;to do
D
to do ;to do