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87. Medical researchers are painfully aware that there are many problems (that/which) they haven't found solution to (他們至今還沒有答案)。
88. What most parents concern (大多數父母所關心的) is proving the best education possible for their children.
89. You'd better take a sweater with you in case it (should) turn cold.(以防天氣變冷)
90. Through the project, many people have received training and decided to launch their own enterprose (決定自己創業)。
91. the anti-virus agent was not known until a doctor discovered it by chance.(直到一名醫生偶然發現了它)。
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