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That it keeps raining cats and dogs ________ the tourists.
#96130
A
worry
B
worried
C
worries
D
worrying
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 While watching television, _______.
#98457
A
the doorbell rang
B
the doorbell rings
C
we heard the doorbell ring
D
we heard the doorbell rings
Play, often ______ as an activity for younger children, is still important in the social development of teenagers.
#92505
A
to see
B
seeing
C
seen
D
to be seen
I heard it was going to become cloudy this afternoon, ____ by a storm.
#95098
A
following
B
followed
C
follow
D
to follow
It is _____ thinking about it now.
#98323
A
of no use
B
not use
C
no use
D
not of any uses
There are some health problems that，when ________ in time，can become bigger ones later on.                                                         (2013·浙江，19)
#88745
A
not treated
B
not being treated
C
not to be treated
D
not having been treated