Поставьте предложения в вопросительной и отрицательной формах: .The first machine for producing an electric charge was produced in 1672.

1. Two different types of electric charge exist.

2. The phenomena of lightning and thunder are identical with the electrostatic charge.

3. Electric charge distributes itself uniformly over the surface of a metal sphere.

4. The force between two charges is proportional to the product of the individual charges.

5. A magnetic field exists around an electric current flow.

6. A current flowing in a coil of wire can induce electromagnetically a current in a nearby coil.

7. Electricity is a form of energy.

8. Properties of electromagnetic waves and light are identical.

9. The electron theory is the basis of modern electrical theory.

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Aquabike - racing on jet skis. Mountaineering - sport tourism, associated with climbing the mountains. Bison-Track-Show - races on tractors. Basejumping - skydiving with fixed objects. Boking is a new sport, the meaning of which is running and jumping on "spring-loaded stilts" - jumper. Wakeboarding - wakeboarding with tricks. Wingsuit - flight in a special suit-wing made of cloth. Windsurfing - slalom - races on sailing boards, downwind, with bending of signs; Freestyle - tricks on sailboards on smooth water and / or chop; wave riding - riding and tricks on the waves; speed - high-speed races on special sailing boards. Bicycle Moto Cross (BMX) - performing tricks or cross-country bikes. Skiing - downhill from the mountains on special skis. Graffiti-bombing - high-speed drawing of graffiti in unusual conditions. Diving - diving underwater with scuba diving. Hang gliding - flying on a hang-glider

1. Alexander goes...to.. college five days a week.
2. We have modern workshops...on..the second floor and a computer classroom ..on...the third floor.
3. He meets a lot of students..at...the conference every year.
4. Tom comes..into...the room at sits dow n...atthe table.
5. His family likes to go ...out... of town...atthe weekends.
6. The dog  s ...under...the sofa and we cannot see him.
7. His picture hangs...over... the divan bed.
8. We have a beautiful vase..on...table with a lot of flowers...in...it.
9. I see the schoolyard..from...the window.
10. The seminar starts.in. 10 minutes,...at..12 o'clock.