1-C. Background noise often helps people concentrate on music.Background noise often helps people concentrate on music.
バックグラウンドノイズは、多くの場合、役立ちます、人々が集中するのにダヨ、音楽にダヨ。
2-C. In these settings, music may be partly lost in background noise, making it hard for the listener to concentrate on it.In these settings, music may be partly lost in background noise, making it hard for the listener to concentrate on it.
3-C. By fourth period, I was usually too exhausted to concentrate, and I ended up failing two afternoon classes.By fourth period, I was usually too exhausted to concentrate, and I ended up failing two afternoon classes.
4-C. One study showed that background music helped participants to concentrate on tasks longer.One study showed that background music helped participants to concentrate on tasks longer.
5. I suggested to Reagins that he should concentrate his efforts on the future.I suggested to Reagins that he should concentrate his efforts on the future.