Change the words in bold from singular to plural or vice versa, as instructed. Make any other necessary changes to each sentence

1. 
   There's an interesting PhD thesis on water resources in the library, (make plural)
   
2. 
   What were your main criteria in designing your survey? (make singular)
   
3. 
   She was interested in strange phenomena connected with comets, (make singular)
   
4. 
   The hypothesis was never proved, as the data were incomplete, (make plural)
   

1. 
   We must never accept the notion on the role of the United Nations in times of war.
   
2. 
   The task of choosing an analytical on gender and language use very clear.
   
3. 
   The book expresses his viewpoint of dark matter to explain certain observations.
   
4. 
   Tannen has always made her stance that intelligence is connected to race.
   
5. 
   Consumers have different perceptions of family healthcare which changed everything.
   
6. 
   The report laid out a new model of what low price and high quality mean.
   
7. 
   Physicists developed the concept framework is an important stage in any research.
   

1 This essay is based on findings from recent research into cold fusion. The arguments I shall put forward are relevant to our understanding of Newton's laws. For the purposes of this essay, two opposing theories will be scrutinised. I shall refer to Ashbach's and Linn's work, respectively.