Which sentence has an error in subject-verb agrement?

Are these any instance when you misbehaved online? how do you think should you behave now that you have learned netiquette and proper behaviour on the world wide web?

Which line from president reagan’s address sat moscow state university is a fact? a. democracy is the standard by which governments are measured. b. throughout the world, free markets are the model for growth. c. the key is freedom-freedom of thought, freedom of information, freedom of communication. d. every four years the american people choose a new president, and 1988 is one of those years.

Plz change it i can not change this sentences .