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,（）all good men and women throughout the world are standing.

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.

Consonant sounds can be either （）or（）,while all vowel sounds are （）.

A bag contains 26 purple jellybeans, 15 green jellybeans, and 9 yellow jellybeans; these jellybeans are the only items in the bag. If a person picks a jellybean at random out of the bag, what is the probability that the jellybean will be green?

The purpose for the bag or box on top of some survival craft is to（）.

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

The worn-out bags are all second-hand ones（）stated in the Shipping Order.

The worn-out bags are all second-hand ones（）stated in the shipping order.

All the （）in hold No.3 should be bagged.

As to the torn bags,I’ll tell the shipper to（）them up.

All the holds which are to take cereals in bags must be so cleaned that thay meet the requirements of the（）.