The earth became so violent that it was not clear_________ the shape would last or not.
#32770
A
if
B
how
C
whether
D
why
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It is human nature to think back to a golden age ______ one’s country was strong and respected.
#32872
A
if
B
when
C
while
D
after
e-commerce worries some merchants, it contributes to the development of delivery industries.
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A
When
B
Unless
C
While
D
Until
(2013·高考新课标全国卷Ⅱ)I was glad to meet Jenny again，________I didn’t want to spend all day with her.
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A
but
B
and
C
so
D
or
Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
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A
may; while
B
can; as
C
must; though
D
should; for
Hurry up ___ we ___ miss the train.
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A
and, are about to
B
or, are about to
C
or, will
D
and, shall