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

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

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

第一节 单词拼写

　　　 根据所给句子及横线后的汉语意思写出正确形式的单词。(共5小题；每小题1分，满分5分)

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