1. in 1987 the children started to collect information for the school museum. the for school museum 2. the museum started working in 1999. the for . 3. in 1998 the children gave the first concerts for veterans. the for veterans 4. since 1987 children have given veterans gifts and flowers. the children . 5. the children have helped to clean the lakes for eight years. since

1. In 1987 the children started to collect information for the school museum. The children have collected information for school museum since 1987. 2. The museum started working in 1999. The museum has worked for 17 years. 3. In 1998 the children gave the first concerts for veterans. The children have given concerts for veterans since 1998. 4. Since 1987 children have given veterans gifts and flowers. The children have given veterans gifts and flowers for 29 years . 5. The children have helped to clean the lakes for eight years. The children have helped to clean the lakes since 2008.