Homework:  Revised version 
Exercise 30.2
1. The article explores the origins of the concept of democracy. 
2. One small explosion set off a chain reaction, causing massive damage. 
3. The confusion probably stemmed from a lack of communication. 
4. The proposed new tax could have rise to widespread sense of disillusionment. 
5. The disastrous events of 2003 gave precedents for his decision. 
6. The judge explained that there were major consequences for larger families. 
Exercise 30.3 
1. De Routa's work in the 1970s influenced the development of computer science. 
2. The acid seemed to have no effect whatsoever on the plastic. 
3. Everyone hoped for a positive outcome to the meeting between the two governments. 
4. The reason for the failure of the project was a lack of funding. 
5. The impact of global warming for the polar ice caps is now understood more clearly. 
6. The journalist wondered what particular ending the government had in mind when it decided to build a national tennis academy.