23.Read the following passage and mark the letter A, B, C, or D on your answer sheet to choose the word or phrase that best fits each of the numbered blanks. People are living longer, so there are more (21) ______ people. Many young people are doing community service. They help elderly people. They do their shopping. They do their housework. They clean their yards. They (22) ______ paint their houses. Some young people work as hospital (23) ______ In America, they are called “candy stripers” (24) ______ of the striped pink and white uniform they wear. Others are concerned about the environment and work on neighborhood clean-up campaigns. * Question 23: volunteers patients donate donation