87._____________________________(多亏了一系列的新发明), doctors can treat this disease successfully.
答案：Thanks to a series of new inventions
解析：“多亏了”译为“thanks to”；“一系列”译为“a series of”
88.In my sixties, one change I notice is that__________________________(我比以前更容易累了).
答案：I am more likely to get tired than before.
解析：“be more likely to do”是“更容易……”的意思
89.I am going to pursue this course ,__________________(无论我要作出什么样的牺牲)。
答案：whatever kind of sacrifice I have to make.
解析：“无论”译作“whatever”或“no matter what”；“作牺牲”译为“make sacrifice”
90．I would prefer shopping online to shopping in a department store because_________________________(它更加方便和省时).
答案：the former is more convenient and less time-consuming.
解析：也可用it is more convenient and time-saving.
91.Many Americans live on credit, and their quality of life ________________________(是用他们能够借到多少来衡量的), not how much they can earn.
答案：is measured by how much they could borrow
解析：“衡量”用“measure”