Parks provide people 小题1:     a place to amuse小题2:       for a while. In recent decades，however，many parks have been designed to provide 小题3:   (entertain).We call them theme parks. The new parks are usually huge places and have a 小题4:     of things to see and do. Theme parks have a certain idea—a certain theme—that the whole parks is based 小题5: . The小题6:     (old) theme park in the world is Disneyland. It seemed like a magical world which can make your dream come true. But if you are interested in traditional culture and history，go to Dollywood,小题7: you can have fun 小题8:  (learn) all about America‘s historical southeastern culture,小题9:    you can go to Camelot Park,小题10: world of fantasy about ancient England.

12和20的最大公约数是______，12和16的最小公倍数______．