One of the most _____ ways to keep your mind ...

★ Word Form & Verb Tense

One of the most _____ ways to keep your mind stress-free and healthy is meditation

A. effectively

B. effect

C. effective

D. effects

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Yesterday, a terrible accident _____ on the highway causing a lot of chaos and fatalities

A. happened

B. has happened

C. happens

D. was happened