英语作文（通知类型）：3月12日是植树节,我校将组织全体学生参加植树活动

Comrades,
Attention,please!
March 12 is our Tree Planting Day.
We have decided to go and plant trees that day.All the students in our school are supposed (required)to take part in the activity.Each class must take five or six basins to water the young trees.Others are to take spades to dig holes.We are going to gather on the school playground at seven on the morning of March 12.And then,we will take our school bus to the West Hill.Please don't be late or absent.Thank you.