Summarization
Directions: In this section of the test, there are ten paragraphs. Each of the paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Spell out the missing letters of the word.

Usually a combination of causes produces a result. People need to distinguish between necessary and sufficient conditions. Air is a necessary condition for the maintenance of plant life, but air alone is not sufficient to produce plant life. Different causes at different times may produce the same result.
Many causes may l to the same result.