I was just kidding
but now you need to finish it up.
FIRST draw up a truth table of each event-correct answer, wrong answer.
write down what each gate outputs. This WILL assist you in learning and if it doesn't work then why.
A simple logic pen comes in handy (an LED, a resistor and an alligator clip)
look up logic pen circuits. this will really help a lot. Sometimes simple is the best (less to go wrong).
Oh yea I want to see your truth tables just to see if you did your homework.