1. Why are you in such a hurry? ... My exam starts in 10 minutes.
2. I am thinking (т.к. обозначает временный мыслительный процесс) of changing school. / I don't think it's a good idea.
3. Why are you angry? / My sister is always taking my clothes (в данном случае - это показание недовольства, раздражения).
4. Tom looks very stressed. / Yes. He is studying a lot these days.
5. Why are you leaving now? / My train leaves in an hour