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．