1. Volunteer work includes a wide range of activities. Among them are coaching children and youth. A. Coaching children and youth are the most common activities included in a wide range of volunteer working activities. B. Coaching children and youth are included in a wide range of activities of volunteer work. C. Including a wide range of activities, volunteer work involves coaching children and youth. D. Volunteer work includes a wide range of activities, among which are coaching children and youth. 2. It is recognized that students' volunteer work will benefit communities. However, its primary purpose is to contribute to students' development. A. Although it is recognized that students' volunteer work will benefit communities, its primary purpose is to contribute to students' development. B. As it is recognized that students' volunteer work will benefit communities, its primary purpose is to contribute to students' development. C. As the primary purpose of students' volunteer work is to contribute to students' development, its benefit to communities is recognized. D. To recognize the benefit of students' volunteer work to communities, it is to note that its primary purpose is to contribute to students' development. 3. Volunteering has a considerable impact on the education system itself. A. The education itself has been considerably impacted by volunteering activities. B. The impact of volunteering on the education system itself is worth considering. C. There is a considerable impact of volunteering on its education system itself. D. It is the volunteering activities that have considerable impact on education. 4. Volunteering makes a significant contribution to the economy all around the world. A. A contribution from volunteering to the economy has been significantly made. B. The economy all around the world benefits significantly from volunteering. C. Volunteers around the world have made significant contribution to the economy. D. Volunteering has significantly contributed to the world economy in all sectors. 5. Drugs are tested in patient volunteers to monitor adverse reactions to long-term use. A. Patient volunteers help test drugs to monitor their adverse reactions to long-term use. B. patient volunteers are tested by drugs to monitor adverse reactions to long-term use. C.volunteers test drugs for patients to monitor adverse reactions to long-term use. D. adverse reactions to long-term use are monitored after being tested in patient volunteers