Text change doesn't work, please help

Hello, I'm having a problem with html5 on changing text using actions. It worked on the first frame but didn't work anymore afterwards. I'm pretty new to animate, can anyone point out what's wrong here?

first frame:

this.theQuestion.text="Which of the following is a diverging lens?"

second frame:

this.theQuestion.text="Which of the following is likely to happen on the refracted ray of the medium whose optically denser?"

the action on the first frame worked, but the second one didn't.