2. Transform the sentences into Passive.

People use computers in a great variety of fields.

Computers perform different operations.

Students use computers to access the Internet.

Scientists invented computers last century.

Managers will use computers for administrative purposes.

This professor teaches two foreign languages.

The teacher asked the students many questions.

Airplane pilots use computers to help them control the plane.

We shall meet the delegation of foreign scientists next week.
3. Transform the sentences from
Passive into Active.

Usually students are examined in this room.

Students are taught different subjects.

He will be given a good job.

This hostel was built last year.

These problems were discussed at the seminar 2 days ago.

I recently watched a short news report about a study in a chinese university where they tried to find out whether men are more vain than women. The researchers made appointments with their subjects to be interviewed and each has to wait in a waiting room before being interviewed. In each room there is a one way mirror where researchers can video tape the subject's action without being seen. In that study, men looked at themselves in the mirror more than the women. 

Could men be more vain than women?

N the rivers of Australia can be seen floating on the water a small animal. Suddenly it dives under the snag and appear in another place. This platypus-small mammal found only in Australia and Tasmania. Platypus have a small head, flattened body, short legs, a short tail. Duckbill retrieves food exclusively water, under which the long delay, while breathing lungs. He digs out mud, looking for worms there, snails, shells, puts them in the cheek pouches and selected on the shore. On the river bank, in the roots of trees and in the grass platypus burrows himself satisfied. At home two outlets - one on the beach, the other - under water. Like the birds, the platypus lays eggs, but the cubs / like all mammals, milk feeds.