根据听到的内容填入所缺的单词。 This is a special 1._____. A11 the students at this school work on different things. The students in the 2._____ class are learning about plants and they are growing plants in a greenhouse. Look! Some students are 3._____ new flowers. They have been digging since this morning. Other students are cutting the bushes around the school. The bushes are smaller now. The students also build a new 4._____ because the old one is very small. Next week, their parents are going to 5._____ the new greenhouse，so some students are working to finish it. What will you do to make your school more beautiful?