В приведенном ниже тексте некоторые предложения лучше будут звучать в пассивном залоге. Определите какие это предложения и перепишите текст соответствующим образом.

Experts have constructed a car which doesn’t pollute the air. A sun battery powers it. On sunny days the sunlight recharges the battery and the car can then use this energy on rainy or cloudy days. People believe that in this way they can reduce smog in big cities and make the air cleaner. Unfortunately, the car is quite expensive because of its experimental design and the cost of the battery itself. However, everybody hopes that companies will produce it on a massive scale in the next decade.