Which of the following personal qualities will a writer most?
1. compassion
2. intellectual brilliance
3. curiosity
4. perfectionism
5. the ability to get along with others.

3. Curiosity

Explanation:

A writer that is curious about thing most likely will ask questions about everything and will be informed, this can help him expand his vision of the world and the characters and environments he writes about, as well as doing his characters more round while getting to know more and more about people and society.

The two word phrase could be:  "For Every"

When we are writing a ratio or fraction, we are comparing two different quantities. 

Imagine that a track athlete has to run 3 miles for every day of practice. We could write the ratio 3:1.

Imagine that your parents are going to pay you $15 for every A on your report card. We could write the ratio 15:1

The key words are "For Every".