14．Children should go to school for _______(educate)．

12．The young teacher has a strange way of making his classes interesting and _______(live)13．Many fish died because of the _______(pollute)water in the lake．

11．We don't know why he made no _______(appear)at the office today．

10．when prices are l_______．you can go to the store with the lowest price．

B)根据句子意思，用括号内所给词的适当形式填空。

9．People in Japan and people in America behave d_______ at the dinner table．

8．I always feel n_______ when I speak in public．

7．Why are you wearing a coat? It's not very _______(适合的)for this hot weather．

6．She _______(掂量)two apples in her hand and gave me the bigger one．

5．There can be no _______(知识)apart from practice．

4．Spending time with family and friends is very i_______ to us．