A．A competition is held to draw talented students to aerospace career.
B．It has the leading position in the space field.
C．A global rocket launch program is held by engineering students.
D．It is losing its competitive edge in the aerospace industry.

A．Martin's struggle against his political opponents.
B．the opposition's calling a vote of no confidence.
C．Martin's opposition to the United States.
D．the new election campaign in Canada.

A．To build an International Museum of African American History and Culture.
B．To build a National Mall of African American History and Culture.
C．To build a National Monument of African American History and Culture.
D．To build a National Museum of African American History and Culture.