—How do you plan to travel to Beijing, Jack?—I haven’t made up my mind ________to go by plane or not.
#55148
A
if
B
whether
C
when
D
how
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We don’t know Jack        Bruce.
#56908
A
and
B
or
C
about
D
of
Bill can swim, _______ he can’t sing.
#57157
A
but
B
and
C
or
D
so