Complete the sentences with the correct words or phrases below ( Hoàn thành câu với từ hoặc cụm từ dưới đây) old people planted homeless children litter taught 1. We collected clothes and gave them to ________ 2. Those students picked up all___________ the on the street 3. We helped__________ in the nursing home last Sunday. 4. The club members_________ maths to primary students during school holidays. 5. We _________a lot of trees in the park last summer.