... the University of Pennsylvania in 194 6 although computer – like machines were built in the 19 th (2)……. Computer were sold (3)…… for the first time in the 195 0s, and a lot of progress has been ... can’t you d. don’t you8. I think he is American,………… ?a. do I b. don’t I c. isn’t he d. is he 9. Do you enjoy………….other countries?a. visit b. to visit c. visiting d. visited10. We don’t allow…………….in ... option (a. b, c, d) that best completes the passage.TV first (1)…… some fifty years ago in the 195 0s. Since then, it has been one of the most popular sources of (2)……… for both the old and the...