Выделите запятыми придаточные предложения, там, где это необходимо. В каких предложениях можно опустить относительное местоимение. Почему? Persons who break the law will be punished.
This is the dictionary which I bought yesterday.
A man who had taken me across the ferry is a boatman.
The man who lives in floor No. 13 has been arrested.
Mrs Jones who is now seventy years old still lives in the High Street.