Ответ:

1.Who interacted with yesterday's computers?

Scientists,mathematicians, and engineers interacted with yesterday's computers.

2.What service do computers in business provide?

Computers are used in recording business transactions,they reduce paperwork, and controlling all transactions.

3.How do ecologist use computers?

Ecologists using computers to monitor enviromental problems( acid rains,etc.) and suggest solutions for those.

4.How do engineers use them?

They using computers to design replacement for damaged bones.

5.How do educators using them?

Educators using computers in classrooms to perform chemical experiments that might otherwise be dangerous.

6.Where can we find computers in our life?

There seem to be no limit to computer applications:database,modem,hard copy and others.

7.What coputer manufacturers do you know?

I know such manufacturers as Microsoft,Intel and others.

Насчет последнего не очень уверен;)