阅读下面短文，根据短文内容完成表格中所缺信息，每空一词。
Do you know that a student can produce up to 240 pounds of school waste and lots of waste gas during a term? This includes transportation, food, paper, pens, pencils and so on.
Transportation
Many parents like driving their kids to school every day. We all know waste gas from cars is a main cause of air pollution. If parents who live in a neighborhood can drive their kids to school by turns each day, that'll be better. Another way of going green is to walk to school if students live near it.
Food
It is surprising that only one primary school could produce up to 19,000 pounds of lunch waste each year. That is only one school. One way to help take care of the environment is to stop using plastic bags. There are all kinds of environmental boxes for students to put their food in.
Paper, pens and pencils
A lot of paper is thrown away by American students. They throw away about 1.6 billion pens every year. They waste many pens and the chemicals of them are bad for the environment. Much more pencils are thrown away than pens. Pencils are made of trees, so if more pencils are thrown away, more trees will be cut down. So students should reuse paper, pens and pencils instead of throwing them away.
Backpacks
As fashion comes and goes, almost every kid needs a new backpack every year. They can save a lot of money and materials（材料）if they reuse the same schoolbags.
Students and the environment
Transportation
If possible, parents in a neighborhood should take
____to drive their kids to school each day. Students can go to school on
____if their homes are not
____from their school
____
Students should use environmental____to hold their food for lunch____of plastic bags.
Paper,pens and pencils
About 1.6 billion pens are____away by American students every year
Pencils are made of____.Students should____paper, pens and pencils.
Backpacks
Almost every student needs a new backpack every year as____changes.
