[ 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:
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Articles › ViewHe plays ___ piano every day.
A. a
B. an
C. the
D. X
Grammar › View
Choose the sentence with correct tense consistency.
A. By the time we arrived, the movie had started.
B. By the time we arrive, the movie had started.
C. By the time we arrived, the movie starts.
D. By the time we arrive, the movie starts.