Переведите предложения, обращая внимание на перевод местоимения one.1. He knows that

Переведите предложения, обращая внимание на перевод местоимения one.
1. He knows that no one can help him.

2. The old equipment is worse than the new one.

3. One must know that X-rays produce bad effect on man.

4. I have many books at home. The most interesting ones are on history.

5. One can easily do this work.