29.The room was filled by smoke
30.All the works of the plant were being instructed by the chief engineer.
31.Our written work to us was returned by the teacher.
32.Her report had been finished by noon by her.
33.Five suspects have been arrested by the police.
34. The house is structed by lightning.
​35.Tom has been operated since 10 o'clock by Mary.

29.The room was filled by smoke
30.All the works of the plant were being instructed by the chief engineer.
31.Our written work to us was returned by the teacher.
32.Her report had been finished by noon by her.
33.Five suspects have been arrested by the police.