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.

A.Why do you say so?
B.Thanks. That’s a nice compliment.
C.Sorry, I don’t like it.
D.I think so.

A.Why not?
B.Beat me!
C.How come?
D.You bet!

A.course
B.school  
C.class  
D.term

A.course
B.school  
C.class  
D.term