根据句子的意思和首字母提示，用适当的词填空，使句子的意思连贯与正确。
－Have you ever been to Xi'an?
－Yes, I have been there t_________．
It often s_________ in the north of China in winter．
Fifteen and twenty-five is f_________．
We listen with our e_________．
S_________ is the best season for planting trees．
We usually have three m_________ a day．
Have you seen my pen? I can't f_________ it．
Your trousers are d_________．You must wash them．
根据句意完成已给出首字母或汉语提示的单词，使补全后的句子意思通顺、语法正确。
As we know, China is an _________(亚洲)country．
The Smiths go to _________(教堂)every Sunday morning．