1) People... (to take) photos since 1851.2) He has goy a headache He(not/to sleep) for a long time.3) Mary looks tired. How long she..-, (to work) on her History project?4) Everything is white outside. It... (to snow) all night.​

1. Choose the right variant:
The engineers … new methods in their work now.
c) are applying

2. Choose the right variant:
We … already them about the prices and terms of payment. 
d) have informed

3. Choose the right variant:
These machines are as … as that ones.
a) expensive
d) expensive

4. Choose the right variant:
If you … I’ll consult the financial manager.
b) don’t hurry

5. If you are interested in our notebooks we … to supply
you with any model on mutually acceptable terms.
d) will be able

6. Choose the right variant:
Advanced technologies must be used … the scale of production.
b) to increase

7. Choose the right variant: Многие проблемы, встретившиеся в проекте и обсужденные здесь, являются общими для обеих форм структуры.
Many of the problems … in the design and … here are common in both forms of structures. 
c) met/ discussed

8. Choose the right variant: 
Agriculture and manufacturing … hundreds of new goods for consumers every year.
e) provide

9. New better products … by companies under conditions of competition.
a) are introduced

10. Вода, нагретая в реакторе, подается в теплообменник.
d) The water heated in the reactor is delivered into the heat exchanger tubes. 

11. If you want to get information about goods you send to the firm … .
b) an order

12. He improved his report by … the end. 
d) changing

13. The mechanical engineer (должны обучаться) in mechanics, hydraulics and thermodynamics and must know such subjects as metallurgy and machine design.
e) must be trained

14. The following examples were made use of.
b) Past Simple passive

If it's a vacation now, I would go to Moscow.2. Call her yesterday, we would not look so stupid now.3. Come on time, they would have finished work.4. If this were true, he would not deny it.5. Warn us, we would never interfere in this matter.6. If he were an artist, he would write my portrait.7. What would Gorky write about if he were alive now?8. Tell him about this before, everything would be different now.9. If I had money then, I would fly by plane.10. If I were again in these places, I would definitely go hunting.11. Put the letter in your bag, you would not lose it.12. I would buy my son skates, he can ride.