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

A.You can’t go out with your friends in case you cannot finish your homework by 5 p.m.
B.Unless you finish your homework by 5 pm, you can go out with your friends.
C.You cannot go out with your friends provided you finish your homework by 5 p.m.
D.As long as you finish your homework by 5 p.m., you can go out with your friends.

A.The trip is not too long for the man to take.
B.The man is too old to take such a long trip.
C.The old man has refused to take such a long trip.
D.The man is young enough to take such a long trip.