трансформируйте предложения в активный залог, используя слова they, we, somebody в качестве подлежащего, где это необходимо
1. Electric cars will be widely used in future.
2. The radar has been used for automatic control of ground transport.
3. Today plastics are being applied for car bodies. (корпуса автомобилей)
4. The construction of the dam (дамба) has been completed this month.