Employees may contribute some percent.Logical formLearned from8 sentences. (Greenhouse gases) may contribute to (climate change).Logical formLearned from8 sentences. Articles may be contributed by practicing educators.Logical formLearned from8 sentences. (Nitrogen oxen) may contribute to (acid rain).Logical formLearned from8 sentences. Changes may contribute to an increase.Logical formLearned from8 sentences. (Department scientists) may contribute to society.Logical formLearned from8 sentences. Factors may contribute to difficulties.Logical formLearned from8 sentences. A donor may contribute.Logical formLearned from8 sentences. Care of assets may contribute to the (business climate).Logical formLearned from8 sentences. Projects may contribute to sustainable development.Logical formLearned from8 sentences. Factors may contribute to a decline.Logical formLearned from8 sentences. An organization may contribute.Logical formLearned from8 sentences. Members may contribute funds.Logical formLearned from8 sentences. Activities may contribute to health.Logical formLearned from8 sentences. Items may contribute to an iranian program.Logical formLearned from8 sentences.