Answer:
1. What is the longest river in the United States? Interrogative pronoun.
2. The Missouri, which flows 2,540 miles, is the longest river. Demonstrative pronoun.
3. In fact, the Missouri is one of the longest rivers in the world. Indefinite pronoun.
4. How many of the world's rivers are longer than the Missouri? Indefinite pronoun.
Step-by-step explanation:
Pronouns are the words that we use instead of a noun. There are different types of pronouns- be it demonstrative, relative, interrogative, or indefinite pronouns.
The given sentences and the type of pronouns they are, are given as below-
1. What is the longest river in the United States?
Interrogative pronoun.
2. The Missouri, which flows 2,540 miles, is the longest river.
Demonstrative pronoun.
3. In fact, the Missouri is one of the longest rivers in the world.
Indefinite pronoun.
4. How many of the world's rivers are longer than the Missouri?
Indefinite pronoun.