spanish please help and explain 98 points

1. Fill in the blank with the correct definite article (el, la, los, las) in Spanish: ____ papeles

2. Fill in the blank with the correct indefinite article (un, una, unos, unas) in Spanish: ____ clase

3. How do you make the following word plural? la silla ______________

4. How do you make the following word plural? la luz ______________

5. How do you make the following word plural? el examen ______________