Choose the answer that best fits in each gap in the text below

In 1945 leaders from 51 countries met in San Francisco, California and organised the United Nations (often called the UN). World War II had just ended. Millions of people had died and (1) was destruction everywhere. People hoped (2) could build a future of world peace through this new organisation. The United Nations has four main goals and purposes:

1. To work together for international peace (3) to solve international problems;

2. To develop friendly relations among nations;

3. To work together for human rights for everyone of all races, religions, languages and of both sexes.

4. To build a centre where nations can work together for these goals.

Today almost every country in the world is a member of the UN. Each country signed an agreement that says:

• All members are (4) .

• All members promise to solve international problems (5) a peaceful way.

• No member will use force against another member.

• All members will help the UN in its actions.

• The UN will not try to solve problems within countries except to international peace.

Obviously, the United Nations has not been completely successful in it. There (6)____several wars since 1945. (7)____ , the organization has helped peace to some countries that were at war. It has helped people (8)_ left their countries because of wars. It has helped bring independence to colonies.

The word "plunge" in the passage is closest in meaning to