Вопрос по английскому языку:

Помогите пожалуйста очень очень необходимо. Спасибо. И может ли артикль А стоять вначале предложения.
Нужно вставить пропущенные артикли a, the
Zack Barrington is ____ plant thief. He was in London last week. ____ police followed his car. Zack's car crashed and he jumped into ____river Thames. ____ policeman pulled him out of ____ water. Near the police station, Zack opened ____ car door and he escaped. I think he's in ___ rain forest now. Kate and Sam are now with Joe Alexander and Professor Wallace in ____ rain forest.