[ Grammar ]
Lily, you … worry about it.
A. not must
B. don’t must
C. must not
D. mustn’t
Select your answer:
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Grammar › ViewI ___________ study for exams.
A. don’t
B. doesn’t
Vocabulary › View
Which word means the way an organism acts or responds to its environment?
A. behavior
B. life cycle
C. mate
D. species