单项选择题

We have long speculated that if there are other warm, wet and cozy planets like ours, they might ______ carbon-based life like ours.

A．harbor
B．labor
C．monitor
D．toil
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单项选择题
Stocks are not goods — they merely are ______, exchanging current cash flows for future ones.
A．conducts
B．conduction
C．conduits
D．products
单项选择题
Their issuance for psychologists will impact not only on the role of current practitioners, but on the training and justifying of future ______, as well as the function and public image of the profession.
A．one
B．ones
C．case
D．cases
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