What to do during silent parts

Hi, I am new to Headspace and meditation. I am currently at Basics 3. The increase from 10 to 15 minutes was difficult and the immediate increase thereafter to 20 minutes a real shock. Can anyone please explain to me what I am supposed to do during the long pauses? For example when the speaker asks us to think about our intentions why we mediate „in one or two sentences“- followed by a 2 min pause. What am I supposed to do after finishing my thoughts (which takes me about 30 secs)? Focus on the breath? Or keep thinking about my intentions? I feel really lost here. Another example would be the bodyscan. I am done after 1 minute, but the pause is 3 minutes long. What do I do here?

Thank you for you inputs!