Why don't you make full use of this opportunity to speak to the foreigners in English? It apprears that he has got use to his high school life through his efforts.
Why didn't you make use of this opportunity to conmunicate with foreigners in English? It appears that he have adapted to the senior middle school's life.
Why don't you make full use of this opportunity and communite with foreigners in English? Through his efforts, it appears that he is used to the senior high school life.