If there are _ trees,the air in our city will be _ fresher.

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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
• If these is_____pollution(污染),the air in our city will be_____dirtier.
• In order to make our city green ____ A it is necessary to have planted more trees B many more
• trees are planted in our city every year.
• trees make our air_______ltrees make ______to keep us alive and______
• The air in our city now is ___________than it was befor
• We should plant more trees to make our city more b( )
• If we want to make our city() ,we must plant more trees.A.is greenB.is greenerC.greenerD.to green
• now the air in our city is-----than it used to be .something must be done to stop it.A very good
• I hope there will be_____(much)trees in our city
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