Вставить пропуски the dog a small tail? yes,

Does the dog have a small tail? yes, it does. это правильно, так как хвост у нее есть всегда, значит нужно время present simple! ответ выше неправильный!

Is the dog has a small tail? yes, it is

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.  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.