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 I just don't understand_______ that prevents so many Americans from being as happy as one might expect.
#85399
A
why it does
B
what it does
C
what it is
D
why it is
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— Why didn’t they complete the task in time?— Because it was not until late afternoon _____ they began to solve the major problem．
#85277
A
when
B
that
C
before
D
which
 Where do you think ________ we can buy that best­seller?
#84708
A
it is that
B
is it that
C
that
D
it
It was last night ________ I saw the comet.
#84749
A
the time
B
when
C
that
D
which
It ___ the students in your class who came to see you then.
#85390
A
is
B
was
C
were
D
are
-------What is it       made Carl determined to give up smoking?-------Watching how his father died in pain from lung cancer.
#85027
A
which
B
how
C
who
D
that