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Scientists finally _____ find a cure for the diseases after years of research.

A. Managed to
B. Can
C. Could

Tomorrow morning, both escalators in the store will be turned off periodically in order to perform _____ maintenance.

A. required

B. requiring

C. requires

D. require

May is a talented pianist and she often …….. at concerts.

A. perform

B. performs

You _______ take your medicine

A. could

B. should

C. able