Переведите их на русский язык, обращая внимание на функции причастия прошедшего

Переведите их на российский язык, обращая внимание на функции причастия прошедшего времени: 1. When offered to work abroad, A. Popov refused. 2. Houses built of polymers will be most durable. 3. The results obtained prove that in the near future there will be large light ships мейд of plastics. 4. Natural rubber is a material that becomes soft when heated and hard when cooled. 5. The building is covered with a special film produced at the plant.