----- Nội dung dịch tự động từ ảnh -----
Alexander Graham Bell, the American (31)________ and teacher of the deaf, was most famous for his invention of the telephone. He was born (32)________ March 3, 1847, in Edinburgh, Scotland, and educated at the universities of Edinburgh and London. He (33)________ to Canada in 1870 and to the United States in 1871. In the United States he began teaching deaf mutes, publicizing the (34)________ called visible speech. The system, which was developed by his father, the Scottish educator Alexander Melville Bell, shows (35)________ the lips, tongue, and throat are used in the articulation of sound. In 1872 Bell (36)________ became part of Boston University, where Bell was (37)________ professor of vocal physiology. He became a naturalized U.S. (38)________ in 1882.

31. a. surgeon b. inventor
32. a. in b. at
33. a. left b. sent
34. a. system b. problem
35. a. when b. where
36. a. discovered b. founded
37. a. pointed b. determined
38. a. citizen b. citizenship