We can see a ________ line for cars in the street.
A. continuous
B. constant
C. frequent
D. continual
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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
The only thing he ________ about is money.
A. matters
B. cares
C. unfamiliar
D. likes
Mr. and Mrs. White have ________ a very good housekeeper.
A. hired
B. rent
C. borrowed
D. lent