The warship made for the open sea and gradually ______ on the horizon.
A. appear
B. vanished
C. appears
D. vanish
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People usually ______ Japan ______ high tech consumer products.
A. connect, to
B. links, with
C. associate, with
D. associates, to
______, six of every ten students live in the school.
A. in advance
B. on advantage
C. on average
D. in average
Unemployment is a common ______ in capitalist countries.
A. phenomenon
B. philosophy
C. photographer
D. phenomena
People of different ______ may speak different languages.
A. nation
B. nationalities
C. national
D. Nationality