请问 high school student前加a还是an

请问 high school student前加a还是an exchange student 前用a还是an? he is a student of —— international middle school前面是加a,还是an, orange前加an还是加a r u a high school student as a high school student… soon you [ ]a senior high school student. Are not you a high school student? 请问那些单词前加a ,an NBA 前加冠词a还是an Asian前加an还是a exciting前加a还是an