[ Grammar and Vocabulary ]
Neil Armstrong was ________ man to walk on the moon.
A. a
B. an
C. the

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Grammar and Vocabulary › ViewIf you _______ (be) here in the summer, you’d have seen some great sunsets.
A. had been
B. had not been
C. has been
D. are
Grammar › View
Where are Elliot and Billy? They’re _____ in the sea.
A. swim
B. swiming
C. swimming