How to write summaries for literature survey?
He has asked you to write a summary of the works. I expect he wants to assess how you write, as well as your understanding of the papers themselves.

Copying the abstracts verbatim not only obstructs this goal, but is also plagiarism. The ideas and words are not your own and you should not try to pass them off as such. 

Read the papers carefully and summarise them in your own words.