答案:Please come to school earlier tomorrow, everyone.Why? What's happening?Tomorrow's March 12th12. It's Tree Planting Day. We're going to plant trees. We want to make our city greener.Wonderful! But shall we all go to the same place?No. Group One will go to plant trees in our school garden. Group Two will go to look after the trees near our school, and Group Three will plant trees in the housing estates behind our school.Will Mrs Chen join us?Sure. But I think she'll be a few minutes late.