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
Humidity is so intense in some parts Of the tropics that Europeans find they are unable to ______.it.
[A] maintain
[B] persist
[C] endure
[D] sustain
单项选择题
The Car Club couldn't ______ to meet the demands of all its members.
[A] assume
[B] ensure.
[C] guarantee
[D] confirm
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