A.stressful
B.prepare  
C.pressure  
D.future

A.it’s expensive to fix
B.all of its parts can be measured
C.it can be damaged by bad habits
D.it has many complicated parts

A.it’s expensive to fix
B.all of its parts can be measured
C.it can be damaged by bad habits
D.it has many complicated parts

A.remind us to take care of our body
B.test our knowledge about the body
C.show us how amazing our bodies are
D.illustrate that we may have complicated health problems

A.improper eating  
B.serious illness
C.drinking too much alcohol
D.accidents

A.cry  
B.scratch your body
C.make unhappy expression on your face
D.scream

A.Ways that our body is similar to a machine
B.Taking care of our body
C.Important habits for a healthy body
D.How our body work

A.body
B.exercise  
C.machine  
D.repair

A.sleep
B.stress  
C.accidents  
D.eating junking food

A.physicist
B.digestion  
C.professor  
D.discover