Помогите воткнуть артикли an, a, the!The park keeper found some litter

Помогите вставить артикли an, a, the!
The park keeper found some litter in _ park. First he found _ crisp packet . _ packet was in_ middle of _ football pitch. Then he found _ old comic. _ comic was under _ tree near _ lake. Then he found some orange peel behind _ fence next to _ bus stop.