Where in the sentence should the writer add a hyphen? I spend about-half my time, he spends two thirds of his time, and she spends a quarter, or maybe a third, of her time on research.
I spend about half my time, he spends two-thirds of his time, and she spends a quarter, or maybe a third, of her time on research.
I spend about half my time, he spends two thirds of his time, and she spends a quarter, or maybe a-third, of her time on research.
I spend about half my time, he spends two thirds of his time, and she spends a quarter, or maybe-a-third, of her time on research.

the second sentence, because fractions like "two-thirds" or "three-fourths" are always hyphened.  "a quarter till two", "a third", and things like that don't need to be hyphened. :)

you can change by someone having a negative opinon of you in many ways for example thi can lead to depression and taking of ones life also known as sucide this effects there self esteem and ego in a negative way making them feel sad depressed and stressed causing them to act gloomy and sad if this continuses this can lead to self harm or much worse things.

hope i .

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)