描述旅行经历：went to..., saw... — 英语填空题
题目
上周日，Lily和爸爸妈妈去北京旅行。请根据中文提示，用动词的适当形式完成句子（每空一词）：Yesterday we ___ (go) to Beijing by train. In the morning, we ___ (see) the Great Wall. It was so long! In the afternoon, we ___ (see) many old buildings in the Palace Museum（故宫）. What a wonderful trip we had!