Point out the problems of the following sentences, and then revise them. 1) Ron tries to call home once a week. To stay in touch with his parents. 2) Andy forgot the time he missed the final exam. 3) Uncle John together with all my relatives are coming to the wedding. 4) We never buy fresh vegetables at the store because they charge too much. 5) This university has a few well-known professors at home and abroad. 6) Having played basketball for more than an hour, my dinner was cold. 7) While reading the book last night, an article on solar energy attracted my attention. 8) Betty plays tennis like a professional and swimming like a fish. 9) Petroleum is used not only to make fuels but also in plastics. 10) First proofread your paper and make any necessary changes. Next you should retype it. 11) Students who work while studying in school face special problems. For one thing, you seldom have enough study time. 12) We visited several cities, including the Boston, Los Angeles and Seattle; and while we were in the Seattle, we paid a visit to the Town Hall for about half a hour. 13) Comparatively, the plot of Henry James ’ s novel is more attractive than Ernest Hemingway. 14) Looking out of the window, only dull gray buildings can be seen. 15) Everybody should return the books he has borrowed within a week.