For that opening sentence, I'd go with something along the lines of this:
"If I had to summarize my summer vacation, I'd say it was uneventful, but enjoyable."
"My summer vacation was busy to say the least."
"I didn't have the best time with my summer vacation, but it certainly was a vacation."
"I spent my summer vacation the way kids are supposed to; doing absolutely nothing."
"This year's summer vacation was the best I've ever had, and I'd love to tell."
Um.... did you have a question?
I believe it is G. The team determined that fluid running along the brains blood vessels carries waste away from the brain