Locate the topic sentence and tell which paragraph shape and pattern type this paragraph is.
1 The art of letter writing seems to have declined sharply in recent years. 2 Perhaps the rising cost of stationery and postage is a factor. 3 Most people today are so busy with their jobs, their families, and their hobbies that they do not feel they have time to write letters. 4 To a certain extent, television and personal computers have replaced communicating with friends as a form of entertainment. 5 The advent of the telephone and the use of e-mail, however, are probably the most significant factor in the decrease of letter writing, because they give instant access to friends and loved ones.