;Revision;Didyougoonaschooltrip?;Awastewaterplant;Helen:Hi,FuXing.Howwasyourschooltriptothewastewaterplant?Wasitboring?

FuXing:No,itwasn’tatall.Itwasreallyinteresting!

Helen:Wow!Whatdidyousee?

FuXing:Wesawtheplantmakedirtywater_______again.

Helen:Really?How?

FuXing:Well,first,_______waterfromourhomesgoesintotheplant.Then,specialscreensremovelargepiecesofwastefromthewater.

Helen:Whathappensnext?

FuXing:Well,_______machinesremovegermsandotherthingsfromthewater.Thesethingsareusuallytoo_______tosee.Ittakesafewmorestepsafterthatbeforethewaterbecomescleanagain.

Helen:Wow!Iusedtothinkitwas_______togetcleanwater.

FuXing:Metoo!Ididn’trealizeitwasso_______.;

Howwasherschooltrip?;Howdoestheplantmakedirtywatercleanagain?;;Lastweek,FuXingsclasswentonaschooltriptoa_________plant.Theplantturneddirtywaterintocleanwater.FuXinglearntaboutthecleaningprocess:

First,dirtywatergoesfrompeoples_________totheplant.Thentheplantusesscreenstoremovelargepiecesof_________fromthedirtywater.Next,large_________cleanthewater.Theyremove_________andothersmallthings.Ittakesafewmore_________beforethewaterbecomescleanagain.

;;Helen:Hi,FuXing.Howwasyourschooltriptothewastewaterplant?

Wasitboring?

FuXing:No,itwasn’tatall.Itwasreallyinteresting!

Helen:Wow!Whatdidyousee?

FuXing:Wesawtheplantmakedirtywatercleanagain.

Helen:Really?How?

;FuXing:Well,first,dirtywaterfromourhomesgoesintotheplant.Then,specialscreensremovelargepiecesofwastefromthewater.

Helen:Whathappensnext?

FuXing:Well,largemachinesremovegermsandotherthingsfromthewater.Thesethingsareusuallytoosmalltosee.Ittakesafewmorestepsafterthatbeforethewaterbecomescleanagain.

Helen:Wow!Iusedtothinkitwaseasytogetclean