The paragraph is followed by an incomplete phrase or sentence which summarizes the main idea of the paragraph. Choose the missing words of the phrase or sentence.

In the United States, not everyone is able to attend a four-year college or university. Many four-year colleges and universities are already too crowded. To give more people a chance to get a college education, many cities and towns have built junior community colleges that offer a two-year course of study in a wide range of subjects.
Junior colleges have been built to （） more education opportunities.