根据中文或首字母提示，补全句子中所缺单词。
1．It's difficult to get used to another country's _______（风俗）．
2．The scientist is repeating the _______（试验）on rats．
3．It is bad m_______ to make a noise while eating soup．
4．Spending time with family and friends is very i_______ to us．
5．There can be no _______（知识）apart from practice．
6．She _______（掂量）two apples in her hand and gave me the bigger one．
7．Why are you wearing a coat? It's not very _______（适合的）for this hot weather．
8．I always feel n_______ when I speak in public．
9．People in Japan and people in America behave d_______ at the dinner table．
10．when prices are l_______．you can go to the store with the lowest price．
1．customs 2．experiment 3．1manners 4．important
5．knowledge 6．weighed 7．suitable 8．nervous
9．differently 10．listed