Our maths teacher set so difficult an examination problem ______ none of us worked out.
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A
which
B
that
C
as
D
so that
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Recently our community has launched a campaign among all the residents , ____ we are called upon to do our little but to prevent the worsening environment.
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A
where
B
which
C
as
D
when
I remember early spring mornings in the countryside ________ my grandmother would tell me to sit quietly and then read me books.
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A
which
B
why
C
where
D
when
October 1,1949 is the day_________ the People’s Republic of China was founded.
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A
where
B
that
C
which
D
when
Nancy was always speaking highly of her role in the play，____，of course，made the others unhappy.
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A
who
B
which
C
this
D
what
It was April 29, 2011 ______ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
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A
that
B
when
C
since
D
before