Up to 11 people can use the elevator at one time.
A. Over
B. Less than
C. As many as
D. At most
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It is believed that this virus is implicated in the development of several diseases.
A. responsible
B. unimportant
C. produced
D. implanted
A new manager was brought in to revive the moribund business.
A. old-fashioned
B. operating ineffectively
C. start-up
D. promising
Silver, copper, and brass need to be polished frequently to prevent them from tarnishing.
A. discolouring
B. wearing out
C. losing value
D. brightening
After she spent a day with screaming children, her nerves were completely frayed.
A. less tired
B. dissatisfied
C. frightened
D. worn out