1.Medical researchers are painfully aware that there are many problems __________________(他们至今还没有答案). 2.___________________________(大多数父母所关心的) is providing the best education possible for their children. 3.You’d better take a sweater with you ________________________________(以防天气变冷). 4.Through the project, many people have received training and _____________(决定自己创业). 5.The anti-virus agent was not known ___________________ (直到一名医生偶然发现了它).
参考答案： 1. that they haven’t found answers to 解析：考点是定语从句，注意answers后面的介词to不要弄丢。 2. What most parents are concerned about 解析：考点是主语从句。 3. in case it (should) turn(s) cold 解析：考点是特殊虚拟语气in case用法，should+动词原形，should可以省略。 4. decided to start their own business 解析：考点是词组decide to do sth.，注意时态。 5. until it was accidentally found by a doctor 解析：考点是词组not … until, 时态。
