语法填空。（10分，共10小题，每小题1分）
Are there any activities on ____(protect) the Earth in your school? Well,
in our school, we have such an activity_______ (one) a month. For example, we want ________(plant) trees in the forest this month. We all know trees are very important________ our daily lives. They provide lots of things________ us. The forest is about two . ___________(kilometre) away, so we will walk there. There ________ five groups of students and each group needs to plant thirty ________ (tree). After that, we will take some _______(photo) there. I’m sure we will have ______ nice day.