________ illness is increasing all over the world.
A. Mind
B. Mental
C. Military
D. Perception
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These words were ________ from the sentence.
A. contained
B. hired
C. deleted
D. driven
We can see a ________ line for cars in the street.
A. continuous
B. constant
C. frequent
D. continual
Two U.S. ships ________ the Arctic in 1959.
A. searched for
B. invented
C. discovered
D. explored
Mr. Li and I have kept a ________ of more than ten years.
A. address
B. coincidence
C. friendship
D. congressman