I think it's "Tú eras bajo." because "eres" is present and I'm pretty sure "eras" is the past tense of ser!
im slightly confused but what i can give you is that :
If you or someone likes something you'd say
You like : te gusta or I like : me gusta
And if your agreeing with someone you'd say :
I agree: estoy de acuerdo
And if you don't agree ( disagree ) you'd say :
Estoy en desacuerdo
<em>I hope i helped somewhat?</em>
Answer:
The assignment doesn't have a word bank, so yes, you choose on your own.
I encourage you to use a translator so you can understand it better incase you cant read spanish.
Explanation: