Studies show that for each hour of _____ exercise, people ...

★ Word Form & Verb Tense

Studies show that for each hour of _____ exercise, people can gain two hour of additional life expectancy

A. regular

B. regularly

C. irregularly

D. regularity

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

A. effectively

B. effect

C. effective

D. effects