While reading an interesting story book in my room，______________.
#88544
A
the light suddenly went out
B
the doorbell rang
C
someone was shouting outside
D
I heard someone shouting outside
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The factory ________ in the newspaper that they had some old machines for sale.
#93542
A
selected
B
solved
C
designed
D
advertised
____ abroad for two years, the two astronauts went back home last year.
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A
Educating
B
Educated
C
Having been educated
D
being educated
Charles Babbage is generally considered to _______ the first computer.
#94390
A
to invent
B
inventing
C
to have invented
D
having invented
People are talking about the new traffic regulations _______in two months.
#91063
A
to be put on
B
to put on
C
being put on
D
put on
Some very common things such as to the sun for a long time will do harm to people's skin and even cause skin cancer
#90764
A
exposing
B
being exposed
C
having exposed
D
exposed