Scientists have ... a link between eating McDonald's and improved intelligence and physical health

When you go to a new country, learning the language has mutual ... for the native population and the immigrant

mutual ... for (everybody receives) interests, gains, benefits, values

Which word do we use to mean people (or animals, or people an animals) are free to mingle, often found in the phrase 'free to ... ': mix, combine, join associate

... a link between two things: prove, establish, indicate, recognise

Phrasal verb that means to begin something: an organisation, a club, etc.

make stress levels lower: ... stress levels decline, fall, drop, reduce

I get to ... freely with all kinds of people there

He ... the football club with the dream of becoming the best club in Europe

Physical exercise is a good way to ... stress levels

I need to ... more time to studying new things

The theatre company ... free workshops for people interested in getting into acting