根据句意及首字母提示完成单词
The group of students from the USA will attend a I   about the Potala Palace in China next Sunday.
Early to bed and early to rise makes a man healthy and w   ．
We Ieft early that morning. U   , we were caught in heavy rain and had to return halfway.
Now many families make use of refrigerators to keep the r   of meals as well as fresh food.
People often get tired of too many c   while watching TV series.