<span>my birthday will be,I'm going to do in Safa. I will invite my friends.I'll order some pizza and Coca Cola.we have fun otprazdnuem</span>
Once electricity was discovered, it was used as a "postman", transmitting information at lightning speed. By wire transfer electrical signals learned, transfer telegrams and live human speech. It was a victory over the space! But telephone and telegraph wires will not last for a ship or plane, the train or car.
Bridge the space people helped radio (translated from the Latin word "radio" means "radiate", it has a common root with another Latin word - "radius" - "beam"). To send messages without wires need only radio transmitter and receiver, which are connected by electromagnetic waves, otherwise known as radio waves emitted by the transmitter and received by the receiver.
<span>The history of radio begins with the world's first radio that was created by the Russian scientist Alexander Popov Popov in 1895 constructed a device which, in his words, "to replace the missing man electromagnetic sense" and react to electromagnetic waves. First, the receiver can "feel" the only atmospheric electrical discharges - lightning. And then learned to accept and record on a tape telegrams transmitted by radio. His invention Popov summed up the work of a large number of scientists from several countries.</span>
<span>1 Tim didn't clean the windows himself. past simp
2 They are now building new hospitals in the provinces. pres cont
3 Mary doesn't usually deliver the food to her house herself. pres simp
4 Our managers discuss important matters every Tuesday. pres simp
5 Fred hasn't washed his car himself. pres perf
6 The police have just arrested Jimmy on suspicion of murder. pres perf
7 My husband isn't testing his eye-sight himself. pres cont
8 I won't check my blood pressure myself. fut simp</span>
<span>1. She is </span><span><span>considered to be </span>very polite.
2. Mike </span><span><span>is believed to </span>win the race.
3. The composition </span><span><span>must be finished by Stacy today.</span>
4. Serge is known by e</span><span><span>verybody as a noble man.</span>
5. He was made by his parents to marry that girl.</span>