I.Rewrite the sentences, using Perfect gerunds. 1. They had broken the windows. They admitted it. => They admitted .................................................... 2. Hoa had helped the disabled children a lot in the campaign. She was rewarded for that. => .............................................................................. 3. Nam had taken an active part in the campaign. He was praised for that. => .............................................................................. II. Rewrite the sentences, using the present perfect or the present perfect continuous. 1. I began doing voluntary work in this hospital last year. I'm still doing it. =>.......................................... 2.They saw this documentary film in 2019, 2020 and 2021.( three times ) =>...........................................................