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 Sunshine helps the tree grow. And trees help clean the    .

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to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
Giving a tree a special shape and a definite height.  Removing small side branches and making a tree look less thick.  Allowing too many branches to grow in the middle.  Having a tree surrounded by many other trees.  
to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
Pruning is necessary when there are unwanted branches.  Damage is done to a tree if it is left to grow in its own way.  Diseased or dead branches should be cut away if they are found to rub against each other.  Growing side branches often prevent air from moving freely.  
where    unless    although    until  
to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
which        in which       that         where  
damage the tree  heal itself  cause the disease  give the tree a desired shape  
grows a tree  does a tree grow  a tree grows  grow a tree  
to helps a wound to dry  to covers a rough surface  damages some of the small side branches  allows too many branches to grow in the middle  
Giving a tree a special shape and a definite height.  Removing small side branches and making a tree look less thick.  Allowing too many branches to grow in the middle.  Having a tree surrounded by many other trees.  
damage the tree  heal itself  cause the disease  give the tree a desired shape  
Pruning is necessary when there are unwanted branches.  Damage is done to a tree if it is left to grow in its own way.  Diseased or dead branches should be cut away if they are found to rub against each other.  Growing side branches often prevent air from moving freely.  
Give    Giving    Given    To give  
Giving a tree a special shape and a definite height.  Removing small side branches and making a tree look less thick.  Allowing too many branches to grow in the middle.  Having a tree surrounded by many other trees.  

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