Here are the best options for each blank in the passage:

1. **C. regarded** - "volunteering is regarded as a good way to give children a sense of community responsibility..."
2. **A. growing** - "...Volunteerism is growing across the United States today..."
3. **B. of** - "...they are looking for ways to help young people..."
4. **B. believed** - "It is believed that volunteering helps children discover their talents..."
5. **D. cooperation** - "...learn about cooperation and problem solving."

So, the complete passage would read:

In the United States, volunteering is (1) **regarded** as a good way to give children a sense of community responsibility and to bring the family together. Volunteerism is (2) **growing** across the United States today because people are trying to put more emphasis on family togetherness, and they are looking (3) **for** ways to help young people have a feeling of hope and satisfaction. It is (4) **believed** that volunteering helps children discover their talents, develop their skills, and learn about (5) **cooperation** and problem-solving.