书面表达One possible version:

Dear Catherine,

The Students Council of our school will organize the students to plant trees next Friday,namely 12th,March on Xi Shan,which is two kilometers away from our school.All the students are required to take part inthe activity.

I’d like to invite you to join us in planting trees if you are available.In an effort to make our country morebeautiful and fight against pollution,we plan to carry out an ovcrwhelming campaign.We will gather on theplayground at nine next Friday morning.We will then take the school bus there together.We will spend twohours planting trees and should be back by 12 o’elock.

Looking forward to your reply.

Yours,

Li Hua