新世界英语2008年12月四级翻译
　　87. Medical researchers are painfully aware that there are many problems (that/which) they haven’t been solved yet.
　　88. What most parents are concerned about is proving the best education possible for their children.
　　89. You’d better take a sweater with you in case it becomes chilly.
　　90. Through the project, many people have received training and decided to explore their own enterprise。
　　91. The anti-virus agent was not known until a doctor accidentally found it.