The reason why they failed the test was ____ they didn’t sleep at all the night before.
#79384
A
because
B
why
C
that
D
for which
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One concern people have now is ______ printing passengers’ names and ID numbers on tickets will make it harder to protect their private information.
#79377
A
whether
B
when
C
how
D
that
—We were surprised to hear that the reason_______ she gave for her absence was______ her mother was ill.—Yes，we saw her mother was at the supermarket that morning.
#79364
A
why；that
B
which；that
C
that；because
D
why；because
What the doctor really doubts is ______ my mother will recover from the serious disease soon.
#79433
A
when
B
how
C
whether
D
if