1. Legislation has been introduced in some states that requires plastic bags be made of biodegradable material which gradually _______ over a period of time when exposed to sunlight.   Hint Hint       2. The aria was _______ with the tempo changing continuously in a most unpredictable fashion.   Hint       3. Nature has an apparently _______ source of plants that can be fruitfully exploited for the herbal cure of many diseases.   Hint       4. The educational system had _______ over a period of time when the authorities got preoccupied with petty politics and did not bother to update the curriculum.   Hint       5. Any increase in coal-fired furnaces beyond a particular level necessitates greater _______ the fossil fuels; thus, the capability of an economy to effectively manage energy resources depends partially on _______ the number of industrial fired heaters.   Hint       6. The _______ allowance he received as a pension forced him to spend the rest of his life in _______.   Hint       7. Even though the region was prone to hurricanes, the _______ of the tornado last year was _______.   Hint