Определите видо-временную форму и залог сказуемого в предложении. Письменно переведите предложения на русский язык.
1. Man first set foot on the Moon in July, 1969.
2. Special telephone sets are used at plants in tropical sea climate.
3.A great Russian scientist A. N. Krylov took an active part in the work of the first Atomic Commission.
4.The directed research is being carried out to use underground hot water for heating houses.