[ Vocabulary ]
The researchers were able to ____, step by step, the migration patterns of the ancient civilization.
A. pass down
B. settle
C. trace
D. support
Select your answer:
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Grammar › ViewYesterday’s homework ______ difficult.
A. was
B. are
C. is
D. were
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How many birds were in the garden?
A. One bird
B. Two birds
C. Three birds
D. Four birds