8880My secret for staying young is simple. Put all attention to the part of your brain and keep it young and growing. Keep your mind awake and you'll stay young all over. These are （16) times. Take an int702

16. A. excite B. excited C. exciting D. excites 17. A. learning B. learn C. be learned D. be learning 18. A. where B. what C. why D. how 19. A. when B. who C. which D. why 20. A. becomes B. become C. became D. becoming