B. Reorder the words to make sentences.
1. run out/ non -renewable/ comes/ energy/ from/ that/ sources/ will/ some day.
->
2. fuels/ to/ are/ they/ the/ limited/ harmful/ fossil/ environment/ and/ are
->
3. can't/ non - renewable/ replace/ energy/ resources/ be/ up/ once /used/ are/ they.
->
4. cheap/ but/ releases/ a lot of/ when/ cola/ is/ burned/ it/ pollutants.
->
5. Vietnam/ its/heavily/ currently/ relies/ fuels/ for/ on/ fossil/ energy.
->