根据所给句子及横线后的汉语意思写出正确形式的单词。

1．Every day the chimneys of factories pour a great deal of smoke, _______________ （污染） the environment little by little．

2．There is no easy _______________ （治愈） for loneliness．

3．His company’s exports have increased _______________ （平稳）．

4．A person is most _______________ （失望） when he is in despair．

5．The Russians were _______________ （责备） for the failure of the talks．