What is the correct imperfect Tense for the word in parentheses

Juan y david beban leche. (beber) the verb is conjugated correctly. the verb is not conjugated correctly.

¿debo pedir comida a la habitación? a. es buena idea que pidas comida a la habitación. b. es buena idea que pedir comida a la habitación. c. es buena idea que pediremos comida a la habitación.

Which sentence contains a completed action? when i was a child there was a fair in my town every year. i won a prize at the fair last year.