What the doctors really doubt is _____________ my mother will recover from the serious disease soon. 
#73938
A
when
B
how
C
whether
D
why
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We won’t give up ______ we should fail 10 times.
#67611
A
as if
B
except for
C
in case
D
even if
While we _________, we saw a UFO land on a street. 
#41211
A
were shopping
B
shopped
C
are shopping
D
shop