Many disorders will happen when the ______________________ doesn't work well.
A. sedentary job
B. immune system
C. high cholesterol
Jerome believes that ____________ is the root of success.
A. health-conscious
B. immune system
C. self-discipline
Some people think that schools are institutions that ______________ and restrict students' creativity.
A. kindle students' interest
B. are well-behaved
C. repress students' individuality
ecological degradation
A. the evolution of the ecosystem
B. the improvement of the ecosystem
C. the ecosystem changing into a worse condition
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