When dealing with students, teachers are supposed to adopt _______ and caring approaches, as they are unique young individuals of different personalities. 
#18437
A
abstract
B
efficient
C
flexible
D
effective
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Once harm is _______ to the eco-system, all species will ________, including man himself. 
#19350
A
made; be in danger
B
done; be dangerous
C
caused; be endangered
D
done; be in danger