1.Medical researchers are painfully aware that there are many problems __________________(他們至今還沒有答案).

2.___________________________(大多數(shù)父母所關(guān)心的) is providing the best education possible for their children.

3.You’d better take a sweater with you ________________________________(以防天氣變冷).

4.Through the project, many people have received training and _____________(決定自己創(chuàng)業(yè)).

5.The anti-virus agent was not known ___________________ (直到一名醫(yī)生偶然發(fā)現(xiàn)了它).

參考答案：

1. that they haven’t found answers to

解析：知識點是定語從句，注意answers后面的介詞to不要弄丟。

2. What most parents are concerned about

解析：知識點是主語從句。

3. in case it (should) turn(s) cold

解析：知識點是特殊虛擬語氣in case用法，should+動詞原形，should可以省略。

4. decided to start their own business

解析：知識點是詞組decide to do sth.，注意時態(tài)。

5. until it was accidentally found by a doctor

解析：知識點是詞組not … until, 時態(tài)。