A.learning how to do gardening.
B.spending time with your family.
C.learning how to read efficiently.
D.protecting wild animals.

A.do better than anyone else.
B.fulfill high ambitions in one's work.
C.work and have reasonable aims.
D.start with a relatively low aim.
A.one's interest.
B.one's position.
C.one's health.
D.one's mood.
A.world politics.
B.advances in science
C.areas of life.
D.all the above.