Измените, активный залог на пассивный, переведите полученные предложения на русский язык. 
1. Banks gave investment advice to us yesterday. 2. The general 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. 

1. Investment advice was given to us by banks yesterday. ИЛИ We were given investment advice by banks yesterday. 2. An audit of oil refining company in this region was being conducted by the general accounting office. 3. A variety of software is sold by us to many customers all over the world.