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.

A.For there is shortage of fresh water, wastewater is treated and turned into drinking water.
B.Wastewater is treated and turned into drinking water because there is shortage of fresh water.
C.Wastewater is treated and turned into drinking water though there is no shortage of fresh water.
D.To ensure there is no shortage of fresh water, wastewater is treated and turned into drinking water.

A.For there is shortage of fresh water, wastewater is treated and turned into drinking water.
B.Wastewater is treated and turned into drinking water because there is shortage of fresh water.
C.Wastewater is treated and turned into drinking water though there is no shortage of fresh water.
D.To ensure there is no shortage of fresh water, wastewater is treated and turned into drinking water.

A.as well as
B.friends
C.go
D.at

A.bluefin tuna sashimi is not very popular
B.bluefin tuna are extinct
C.bluefin tuna has become expensive and rare
D.people liked canned or cooked tuna more

A.It is possible to breed tuna in land-based tanks
B.Worldwide stocks of tuna have decreased
C.Canned tuna is mostly made of skipjack tuna
D.There are only few species of tuna in the world