王洋是上海某社区垃圾分类监督员，下文是他对社区内外国留学生进行垃圾分类（garbage sorting)集中指导。根据下图内容，把他的解说词补充完整。每空限填一词。

                          Organizing your household garbage

Dear foreign friends, glad to meet you here. Today I'd like to introduce new garbage sorting rules to you. In Shanghai, we are supposed to 1. the garbage into four groups, namely recyclable, harmful, dry and wet waste.  Paper, plastic, glass, and fabrics is 2. waste while food leftovers, plants, expired food is wet waste. Batteries, light tubes and 3. should be considered to be harmful waste. All other non-recyclable solid waste is called dry waste. We all believe that garbage sorting is 4. for the protection of the environment. Right? If people fail to sort their garbage, they will be fined up to 200 yuan. If all of us take pains to sort garbage, we'll lead a better life. So, let’s start right now.

Give the foreign students a piece of advice about garbage sorting.

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