根据句子意思，用括号内所给词的适当形式填空。

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

2．The young teacher has a strange way of making his classes interesting and _______（live）3．Many fish died because of the _______（pollute）water in the lake．

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

5．Zoos provide clean and safe places for _______（endanger）animals to live．