[ Vocabulary ]
energy sources formed over millions of years from the remains of dead organisms
A. energy conservation
B. fossil fuels
C. renewable resources
D. human impact
E. sustainability

Random Topics:
Comparative AdjectivesPresent & Past TensesGrammar - QuantiflierInfinitive FormsAdverb Clause ConnectorTenses and ArticleGerunds + To InfinitivePassive VoicesActive-Passive VoicesAction, Helping & Linking VerbsOther quiz:
Articles and Quantifiers › ViewShe has lots of friends, but ____ of them will help her.
A. all
B. neither
C. none
Modal Verbs › View
He _____ eat more fruits and vegetables to improve his diet.
A. could
B. would
C. need to
D. must
Tenses › View________ my neighbors were having a picnic, the rain started to pour down
A. when
B. while
C. during
D. before
Grammar › View
The poor helpless orphans _______________ away by the strong tidal waves.
A. sweep
B. were sweep
C. were swept
D. was swept
