19.The rich man has__________wealth.
A. a great deal
B. valuable
C. many
D. untold
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20.The Great Wall is called one of the seven__________in the world.
A. wanders
B. wonders
C. surprises
D. astonishment
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