Помогите, пожалуйста, решить задание по страдательному залогу (английский)

The very first step in the launch of a new product is when the research department has an idea. in the next step, the marketing department / 1. a) looks at / it, and decides if they think it will sell. sometimes, the research department / 2. a) modifies/ the design a little. next, a prototype/3 b) is produced/ to see if it works. then maybe it/ 4. b) is offered / to a small number of customers on a trial basis. if everything looks ok, the new product / 5. b) is manufactured/ on a large scale. the marketing department /6 b) is promoted/ the product through an advertising campaign, and then it /7. b) is launched onto the market. large quantities of the product/ 8. b) are distributed/ to sales outlets all over the world.