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EX1. Rewrite these sentences in the passive voice.
1. You can see almost every original painting in the Louvre.
Almost ..........................................................
2. How can we solve that problem?
How ...............................................................
3. You must not touch this button while the experiment is in progress.
This button .........................................................
4. You shouldn't make fun of the boy.
The boy ............................................................
5. The pupils must clean the classroom themselves.
The classroom .....................................................
6. We should encourage children to read books.
Children ..........................................................
7. The situation is serious. We must do something about it.
The situation is serious. Something ...........................
8. Drivers as well as pedestrians have to obey traffic regulations.
Traffic regulations .................................................
9. You may leave your luggage with the porter.
Your luggage .........................................................
10. Formerly they might allow passengers to smoke on some flights.
Formerly passengers ..............................................