单项选择题

Since you have failed three of the last four tests, you cannot afford to be ______ about passing for the term.

A．courteous
B．relevant
C．optimistic
D．passive
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单项选择题
Being able to move gives animals many advantages, but it also generates its own demands. For any animal, ______ movement can be unhelpful or even dangerous.
A．ransom
B．retrieve
C．random
D．redeem
单项选择题
He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.
A．occasionally
B．regularly
C．patiently
D．assiduously
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