1. In the past few years, there HAS BEEN a great deal of controversy surrounding soy foods, mostly due to recent research.
2. The last four decades have seen incredible human progress across South America. CORRECT
3. Since the 1990s, there has been a dramatic increase in the number of people with Alzheimer’s. CORRECT
4. Recent studies have RAISED a number of key questions regarding the impact of CCTV on crime.
5. In 2014, an important study by Smith et al. RAISED a number of concerns about online data collection.
6. It is not within the scope of this paper to propose solutions to this issue. This study is simply devoted to UNDERSTANDING the problem.