Government comprises the set of legal and political institutions (that) regulate the relationships (among) members of (a) society and between the society (or) outsiders.

A．the American Navy
B．some early intercontinental travelers
C．those who earned a living from the sea
D．the company which proposed to lay an undersea cable

A．carefully consider the bad effects of any kind of research work
B．give each important problem some careful consideration
C．acquire a great deal of complex and special knowledge
D．give suitable consideration to all the possible elements in a problem