假设你是红星中学高三一班的学生李华，为响应绿化祖国的号召，你班四月十二日去郊区植树，请根据以下四幅图的先后顺序，介绍植树活动的全过程，给某英文杂志的“绿色行动”专栏写一篇以“Green Action in Our Class”为题的英文稿件。
April 12 is memorable because our class had a meaningful experience on that day. In the morning, we bicycled to the suburbs to plant trees, talking and laughing all the way. Upon arrival, we began to work immediately. Some were digging holes. Some were carrying and planting young trees. Others were watering . After getting the work done, we put up a board reminding people to protect the trees. Before leaving we took some photos to record our green action. Seeing the lines of trees, we all had a sense of achievement. We feel it’s our duty to protect and beautify our environment.