[ Tenses ]
They (walk) _________ home when they (find) _________ a lost puppy.
A. were walking / found
B. are walking / find
C. had walked / had found
D. walked / found
Select your answer:
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Vocabulary › ViewScientific help to explore some places and discover more and more remote parts of the world.
A. survey
B. research
C. lead
D. expedition
Modal Verb › View
We _______ get up early because tomorrow is Sunday.
A. don’t have to
B. musn’t
C. can’t