we need 17 trees make one ton of paper为什么把make改成 to make而不是making

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• 根据句意完成下列所缺单词Now paper still ( )from trees.We use a lot of pa[er every day.If we keep on ( )paper,there will not be any trees left on the ( ).If there are no trees,there will be no paper.Every day people throw ( )about 2800 tons of paper in our city .It ( )17 trees to make one ton of paper .this ( )that we are cutting neaely 48000 trees every day.How can we save paper?We can use both sides of every ( )of paper,especially when we are making notes.we can
• we need 17 trees make one ton of paper为什么把make改成 to make而不是making
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