A.The reasons why many people like tuna
B.Causes of the low population of tuna.
C.Various types of tuna
D.Declining tuna stocks and our actions

A.all species
B.bluefin
C.yellowfin
D.bigeye

A.decreasing tuna stocks
B.trying to breed tuna
C.breeding bluefin tuna
D.raising juvenile tuna

A.People can earn their living by going to charity events.
B.U.S. people do not have to pay income tax on charitable donations.
C.Donors can have their names honored for a long time.
D.Donors have a chance to affect the world around them.

A.attacked
B.killed
C.fought
D.caught

A.Altruism is the unselfish desire to help other people.
B.In the US, people donate a lot to religious institutions.
C.In the US, many charity events are held by the governors.
D.Many people give away money to charity for the sake of themselves.

A.colleges and universities
B.other students
C.successful students
D.educational opportunities

A.Charity Activities
B.Charitable Giving
C.To Be Charitable
D.To Be Altruistic

A.Charity Activities
B.Charitable Giving
C.To Be Charitable
D.To Be Altruistic

A.If we do not visit Grandma soon, she will start to worry.
B.Grandma is worried about us, so we should visit her.
C.We need not visit Grandma unless she is worried about us.
D.We should visit Grandma in case she is worried about us.