Вставте нужные артикли:___coal is one of___most important natural cesources of our country

Coal is one of the most important natural resources of our country. — Уголь является одним из важнейших природных ресурсов нашей страны.Coal isn’t one of the most important natural resources of our country.Is coal one of the most important natural resources of our country?What is one of the most important natural resources of our country?Is coal one of the most important natural resources of our country or neighbourhood?Coal is one of the most important natural resources of our country, isn’t it?