[ Grammar and Vocabulary ]
Someday there may be ______ on the Moon and Mars.
A. outposts
B. portholes
C. shuttle
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Grammar › ViewOh! Welcome, Jack! __________.
A. That’s very kind
B. Same to you
C. Bye for now
D. Make yourself at home
Noun, Pronoun, Adjective, Verb › View
Which of the following is a demonstrative pronoun?
A. Who
B. Them
C. This
D. We