用所给单词的适当形式完成下列句子。

1. In some poor African areas, many children died of _____ (hungry) every year.

2. The basic needs of the world population should _____ (satisfy) first.

3. The survey found that men got greater _____ (satisfy) from caring for their

    families than they did from work.

4. The rapid _____ (expand) of cities can cause social and economic problems.

5. We were told to keep all our sports _____ (equip) in the lockers downstairs.

6. The people there enjoy complete _____ (free) of speech.

7. The _____ (discover) of electricity was Franklin.

8. Like many _____ (discover), atomic power can be used for good or evil.

9. The fox struggled _____ (escape).

10. They focused their mind on _____ (do) the experiment.