题目内容：

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.