Трансформируйте предложения в косвенную речь. 1). He said, It has been

Трансформируйте предложения в косвенную речь. 1). He said, It has been proved that ultraviolet light may cause skin cancer. 2). He said, Scientists are searching for alternative sources of energy. 3). He said, Many people living in big cities will have problems with breathing because of exhaust fumes.