Topics: Vocabulary
What is a trace of an ancient organism that has been preserved in rock?
A. oxygen
B. skeleton
C. aluminum
D. fossil
Select your answer:

Random Topics:
Ordering AdjectivesAdverb of MannerVerb Tenses and Sentence StructurePhrasal verbs and Prepositional PhrasesGerunds and TensesWishes & Reported SpeechVerbs and Possessive AdjectiveGerunds/InfinitivesParticiple AdjectivesGrammar - FutureOther quiz:
Grammar › ViewThis picture __________ the contamination of ground water.
A. illustrate
B. illustrating
C. illustrated
D. illustrates
Grammar › View
When did you __________ your mother?
A. visit
B. visited
C. visitted
