选择正确的短语完成句子。 A. take care of the elderly B. throw away the rubbish C. helps classmates with skills D. protect the environment E. look after the left-behind children 1. In order to ________________, we should plant as many trees as possible. 2. The community provides many convenient services to __________________. 3. Don’t _________________. Please put it into the dustbin. 4. The volunteers often go to the villages to _____________________. 5. Lily is studying in a vocational school. She often _____________________.