There projects have proved to be very _____ in dealing ...

★ Word Form & Verb Tense

There projects have proved to be very _____ in dealing with global climate change

A. effectively

B. effect

C. effective

D. effects

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In 21st century, scientists continue to look for new ways _____ serious disease and slow down the ageing process

A. to treat

B. treat

C. treatment

D. treated