Fill in the gaps with wouldn't + the verb in brackets.
(do) I told my little sister how important it was to do the homework, but she it.
We use "won't" and its past form "wouldn't" in the meaning of "do not want", "refuse", "be unwilling" to do something.
I'm trying to talk to him, but he won't listen. (= he doesn't want to listen)
I was trying to talk to him, but he wouldn't listen. (= he didn't want to listen)
— Why are you angry? — The car won't start. (= it "refuses" to start)
He was angry because his car wouldn't start. (= it "refused" to start)