The students in a certain physical education class are on either the football team or the basketball team, are on both these teams, or are not on either team. If 12 students are on the football team, 15 students are on the basketball team, 8 students are on both teams, and 9 students are not on either of these teams, how many students are in the class?

These are the principles, however formulated, for which all good men and women throughout the world,（）of race or creed, education, social position, or occupation, are standing.

Clouds that form as small white flakes or scaly globular masses covering either small or large portions of the sky are（）.

Children who are not active or ______ diet is high in fat will gain weight quickly.

（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.

The goal, which they are unlikely to live to see , is tocure, prevent or manage all diseasesin the next 80or so years.

The master may bind the Shipowner or Charterer（）doing such things as are necessary on the part of the one or of the other to carry out the contract.

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

（75）are individuals and organizations that are actively involved in the project，or whose interests may be affected as a result of project execution or project completion.

are individuals and organizations that are actively involved in the project，or whose interests may be affected as a result of project execution or project completion．

（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.