He kept yawning in class this morning. That is _____ he stayed up late doing his homework last night.
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A
why
B
how
C
because
D
whether
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Believe it or not，I'm sure that is ________ people call the six sense.
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when
B
what
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D
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Mary is a humorous and warmhearted woman and that is ________ she is a most popular person in her community.
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whether
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One reason for her preference for city life is _______ she can have easy access to places like shops and restaurants.
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what
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that
D
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