1. such problem are a feature of old age. (universe ) 2. how glad he was to be with his family after 20 years. ( unity ) 3. they have been working on the of the new model. ( perfect ) 4. the of the water is tasted regularly. (pure) 5. new products are being developed . ( continue) 6. they quickly to distance themselves from the wild animals yesterday. (seek) 7. the people living in america were native americans. (origin)
