87.Medical researchers are painfully aware that there are many problems that they haven’t found answers_to (他们至今还没有答案)
89.You’d better take a sweater with you in case it turn(s) cold (以防天气变冷)
90.Throught the project, many people have received training and decided to start their own business (决定自己创业)
91.the anti-virus agent was not known until it was accidentally found by a doctor (直到一名医生偶然发现了它)
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