Demonstrate the correct use of articles and prepositions: Most big cities have _ university.

Explanation

Articles are used to indicate and define a noun. They are used before nouns or noun equivalents. The definite article (the) is used before a noun to indicate that the identity of the noun is known to the reader. The indefinite article (a, an) is used before a noun that is general or when its identity is not known. The U in university is pronounced with a long "u" sound which sounds like "yew" and is written as j in the phonetic alphabet. So, although the letter is a vowel, it is not pronounced like one in "university" because it does not have a vowel sound. We, therefore, say "a university".