选择下列单词或词组填入每句的空格中。
A. planting B. plant C. visit D. March 12 E. clean F. special
1．_____ is a special day for tree-planting.
2．In China we are _____ a lot of trees now.
3．As we know they make the environment _____.
4．I hope you are enjoying your _____ to our school.
5．People plant trees on _____ days in their lives—for example, their birthday.
6．We ask people to try to _____ three to five trees a year.
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