完成句子根据汉语意思完成下列句子，每空一词 (共20个空格；每空0.5分，满分10分)
小题1:这种药物已经进行过人体试验；现在有一点是肯定的，它有可能降低得心脏病的风险。
The drug has been _____ _____ on humans. _____ is certain now is that it has the _____ to reduce the risk of heart attacks.
小题2:人们建造动物园是为了拉近人类社会和大自然的距离。而且，动物园能为当地的旅游业做贡献，这肯定是对周围地区的经济发展有利的。
Zoos are built to shorten the distance between human society and nature. _____ _____, zoos can _____ _____ local tourism, which is surely _____ _____ the economic development of the local neighborhoods.
小题3:为了找出那起事故的真相，他一直在当年的报刊杂志中仔细搜寻，另外还查阅了所有相关的网页。
In order to find out the truth of the accident, he has been _____ _____ all the newspapers and magazines of that year, along with all the relevant web pages.
小题4:研究显示有些将过多时间用于上网的学生已经辍学，他们往往会脱离周围的人和世界。
The study shows that some students, who spend too much time on the Internet, have _____ _____ and tend to _____ _____ the people and the world around them.
小题5:在完成了一项为期三个月的工程后，她累坏了；为了放松一下，她已决定今年去法国度假。
She was _____ _____ after a three-month-long project and has _____ _____ France for her holiday this year for relaxation.