下面是Rob写给David的一张贺卡，叙述了自己游玩北京的经历，请你用恰当的单词将其补充完整。

Dear David, I’m having a             time in Beijing. I’ve done so many things. I’ve                the Beijng Opera. I’ ve                Beijng duck and I’ve also           the Palace Museum. There’s only one thing I haven’t done. I haven’t              the Great Wall. Bye for now, Rob