根据短文内容填空，每空一词。TheImportanceofTrees Treesareusefultomaninthreeveryimportantways.
Thefirstimportantwayisthattheyprovide (供应，提供)manwithfood, woodandother products
(产品).Treesprovidenotonlymanwithfood,butalsomanyanimalswithfood. Withouttreesmanyanimals
couldnotliveontheearth.It'snoteasyformantoliveontheearth, either.
Thesecondimportantwayisthattreescangiveusshade (树荫).Onahotsummerday, peopleareeager (渴望的，热切的)tohavearestundertheshadeofatreeafrertheyhavewalkedalongway.Youcanimagine (想象，设想)howimportanttheshadeofatreeistomanandtoanimals.
Thethirdimportantwayisthattreeshelptoprevent (防止，预防) drought (干旱)andfloods (水灾).
However, inmanypartsoftheworld, manhasnotrealized (意识到)thethirdimportantway.Wecuttrees
downinlargenumbers.Intheendwehavefoundthatwehavelostthebestfriendswehavehad.
Treesareimportantinmainly______________ways.First, theyprovidehumanandanimalswithfood
andother ______________. ______________, theygivepeople ______________inhot ______________.
Atlast, theycanhelptopreventdroughtandfloods.Treesarereallyourgoodfriends.three,products,Second,shade,summer