bank soal : gerund

Please see the following sentences. Please mark C if it is CORRECT, and I if it is INCORRECT.

1. She is interested in finding out about kangaroo. <.....>
2. Nothing can stop her for not going out tonight. <.....>
3. She is not used to drive a big car. <.....>
4. In your office, who is responsible for taking care of this matter. <.....>
5. It's good to stop smoking now. <.....>