The reason for their unusual behavior remains a __puzzle_

1Sometimes it is __advisable__ to book hotels in advance
A.possible
B.profitable
C.wise
D.easy
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2Jack eventually __overtook__ the last truck.
A.passed
B.hit
C.reached
D.led
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3The scientists began to __accumulate__ dat
A.A.handle
B.collect
C.analyze
D.investigate
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4With __immense__ relief, I stopped running.
A.enormous
B.some
C.little
D.extensive
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5She is __slender__, with delicate wrists and ankles
A.sick
B.weak
C.pale
D.slim
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6Many American women have a poor knowledge of cancer
A.Right
B.Wrong
C.Not mentioned
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7People with no family history of cancer are unlikely to develop cancer
A.Right
B.Wrong
C.Not mentioned
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8More women are dying from cancer than men in America
A.Right
B.Wrong
C.Not mentioned
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9Most American women know too little about how to lower their cancer risk
A.Right
B.Wrong
C.Not mentioned
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10Some American women are just unwilling to change their lifestyles.
A.Right
B.Wrong
C.Not mentioned
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The reason for their unusual behavior remains a __puzzle__.