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1. As we get older, we lose some __________ in our vision. 2. Scientists use a lot of __________ to design their research projects. 3. When I close my eyes, I can really enjoy the __________ of this place. 4. There is a __________ that the treatment will improve your eyesight. 5. I can see from the students' faces that the __________ is interesting. 6. I want to see the building plan to be sure of the projects __________.