[ Vocabulary and Grammar ]
Are they ____ observation?
A. being
B. in
C. over
D. under
Select your answer:
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Grammar › ViewChimpanzees,——————— are intelligent animals, are sometimes playful and noisy.
A. what
B. who
C. which
D. that
Grammar › View
___ English book and ___ ruler are on the desk.
A. A ; an
B. An ; a
C. An ; an
D. A ; a