单项选择题

Research (shows) that employees (whose) obtain satisfaction (from) their jobs (are) more productive.()

A. shows

B. whose
C. from
D. are

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This light bulb doesn't work. Can you () it by another one

A. substitute
B. replace
C. change
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It is vital that enough money () to fund the project.

A. be collected
B. must be collected
C. is collected
D. can be collected
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