单项选择题

They are sure they have all the facts they need to ______ the existence of a black hole.

A．obtain
B．maintain
C．verify
D．display
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单项选择题
Mrs. Lackey was awakened by the ringing of the bedside phone 12 hours after her husband's boat had been ______
A．wrecked
B．collapsed
C．decayed
D．fired
单项选择题
A big problem in learning English as a foreign language is a lack of opportunities for ______ interaction with proficient speakers of English.
A．instantaneous
B．provocative
C．verbal
D．dual
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