Задание 5. Измените активный залог на пассивный и переведите предложения на

Задание 5. Измените активный залог на пассивный и переведите предложения на российский язык.
Сделайте по образчику:
This plant had fulfilled the plan by the end of month. The plan had been fulfilled by the end of month.

1. Banks gave investment advice to us yesterday.
2. The accounting office was conducting an audit of oil refining company in this region.
3. We sell a variety of software to many customers all over the world.