Parents should pay attention to the cases _______ their children have difficulty adapting to new surroundings.
#76184
A
where
B
as
C
why
D
when
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In many countries, government reports, legal papers and most business letters are the main situations _______ English is used.
#78561
A
that
B
when
C
which
D
where
China’s population is expected to increase to about 1.5 billion in 2040, _____ it will start to decline slowly.
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A
where
B
which
C
after which
D
on which
St Petersburg, is a very beautiful city, was once called Leningrad.
#75056
A
which
B
where
C
that
D
what