【正文】
19. We need to learn _______ polite when we make requests. A. how to B. what to be C. what to D. how to be ( )4. The music that his son is playing _______ beautiful. A. sounds B. lo ok C. taste D. listens ( )5. If you want to bee a ________ person, you’d better try that way. A. politest B. more polite C. politer D. much polite