20.The Great Wall is called one of the seven__________in the world.
A. wanders
B. wonders
C. surprises
D. astonishment
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21.The murder remained an unsolved__________.
A. fact
B. truth
C. mystery
D. myth
22.He is easy to become sad when he is happy. He is an__________man.
A. complex
B. emotional
C. eager
D. narrow
23.I can know what it is just by__________.
A. crossing
B. feeling
C. fastening
D. gambling
24.There is some__________on your coat.
A. dirty
B. funny
C. fun
D. dirt