With so many problems,6.a great number of people from all over the world are volunteering to help.Some of them are 7.cleaning up the rivers and lakes.Some are planting trees and flowers.Others are recycling materials to produce less pollution.A few of them are also giving speeches to 8.call people's attention to environmental protection. Some schools are even asking students to bring their own cups to school 9.instead of buying bottled drinks from stores. 导航页导航页 With so many problems, 6._________________ people from all over the world are volunteering to help. Some of them are 7.______________ the rivers and lakes. Some are planting trees and flowers. Others are recycling materials to produce less pollution. A few of them are also giving speeches to 8.__________________________ environmental protection. Some schools are even asking students to bring their own cups to school 9.__________ buying bottled drinks from stores. a great number of cleaning up call people’s attention to instead of