4.　　　 There was a car accident. The two_______ (injure) drivers were taken to hospital right away.

3.　　　 The newly_______ (elect) president of the country is going to give a speech.

2.　　　 The recently ______ (update) virus checking program is working very well.

1.　　　 People are trying to make the once_______ (pollute) rivers clean again.

5.　　　 It remains_______ (see) what measures he will take up next.

Unit2

4.　　　 It_______ (take) a very brave mind to remain calm in such a situation.

3.　　　 Robert was surprised to find the scientist could write about his research in a way that________ (common) people could understand.

2.　　　 What do you suppose______　 (make) a scientist?

1.　　　 As the saying______ (go), a friend in need is a friend indeed.