Place a before millionaire. Millionaire is a countable noun.

The error in the sentence is in part 2, which should be corrected as "that the daughter of a millionaire" instead of "that the daughter of millionaire."

Explanation:

The article "a" is missing before the word "millionaire" in the second part of the sentence. The use of the indefinite article "a" is necessary to make the sentence grammatically correct.

The correct sentence should be: "It is a pity that the daughter of a millionaire is involved in the bank robbery."

Some relevant definitions and formulas used in the solution are:

• Error spotting: A type of language proficiency test that requires the test-taker to identify grammatical errors in a given sentence or passage.
• Articles: Words used before nouns to indicate whether the nouns are specific or general in nature. There are two types of articles in English: the definite article "the" and the indefinite articles "a" and "an."
• Indefinite article: An article used to refer to a noun that is not specific or known to the listener or reader. In English, "a" and "an" are indefinite articles.
• Subject-verb agreement: A grammatical rule that states that the subject and verb of a sentence must agree in number (singular or plural).

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