Many believe that the story first began in America in 1877, when two friends were arguing【B1】______ whether a horse ever had all

Many believe that the story first began in America in 1877, when two friends were arguing(26)over whether a horse ever had all four feet or hooves off the ground when it(27)galloped. To settle the bet, a photographer was asked to photograph a horse galloping and the bet was(28)settled because you could see that all the hooves were off the ground in some of the photos. What was even more interesting was that if the photos were shown(29)in quick succession the horse looked like it was running—in other words "moving pictures".
    The person who became interested in taking the moving pictures to its next step was the famous American inventor Thomas Edison. Actually, he didn ’t do the work himself but rather asked a young Scotsman in his(30)employ a system, which he did. Now this young fellow was clever because the first thing he did was study systems—(31)primitive as they were—of moving pictures and then put all the existing technologies together to make the first(32)entire motion picture system. He designed a camera, a(33)projection device and the film. The system was first shown in New York in 1894 and was really very popular.(34)Apparently people lined up around the block to see the wonderful new invention. There were, however, a couple of problems with the system. The camera(35)weighed over 200 kilograms and only one person at a time could see the film.