빈칸에 들어갈 알맞는 단어좀 찾아봐 주세염^^

Romantic love lasts only a year
Italian scientist have discovered that a chemical in the brain responsible for romantic love fades in intensity over the course of a year. This perhaps explains why that giddy, euphoria, head-over heels-in-love feeling that takes our breath away at the start of a relationship diminishes over time. Researchers from the University of Pavia determined that levels of a protein called Merye Growth Factor (NGF) greatly increase when a person first falls in live. Raised NGF levels spring from the rush of adrenalin, renewed vigor and confidence and lust for life that occur when new love blossoms. Levels of NGF greatly decrease over a year of so as security within the relationship sets in. There is then less urgency to constantly woo a potential partner to ensure they are yours.

Research leader Dr. ENZO Emanuele reported: We have demonstrated for the first time that circulating levels of NGF are ______
among subjects in live, suggesting an important role for this molecule in the ___________ chemistry of human beings. His research team analyzed the protein balance in the ________ of 58 volunteers age between 18 and 31. All of the participants had recently started a new relationship and had that ________ look in their eyes. The researchers compared the levels of NGF in the starry-eyed group with those in 58 people who were single or in _______ relationships. The increased prevalence of the molecule in the new romantics caused sweaty __________ and _________ in stomachs. It may also _________ young men to buy red roses and candlelit dinners.

보기) Steady, bloodstream, butterflies, elevated, induce, social, starry, palms
위 보기 중에 빈칸에 한 개씩만 들어갑니다. 중복된 단어가 없다고 하네요~
고수님들의 귀한 조언 부탁드려요~