Revise the following sentences using a parallel structure. (1) Many people carry not only credit cards but also they carry cash. (2) You do not need to risk carrying cash or to risk to pass up a sale. (3) Credit cards are accepted by department stores, airlines, and they can be used in some gas stations. (4) A student who does well in exams attends class, reads the textbook, and he reviews the notes. (5) We plan to meet in Shanghai on July 28 , we are meeting in Nanjing on the 5th of August, and in Beijing on September 1.