I don't want to do a survey
Why don't you want to take it?
I feel confused and I don't feel so well right now.
I'm sorry you're feeling really ill, you should go home and rest. You don't have to take this survey yet if you aren't ready to.
I might be ready to take it tomorrow.
That's find, you can take your time. There is no hurry for you to finish. If they need it to day they can find someone else to do it.