Which of the following classroom and exam activities require critical thinking skills

Which of the following classroom and exam  activities require critical thinking skills? Why?
1. analysing  an  examination  writing topicc.
2. identifying the mainn argument  in a reading text.
3. writing down a dictation.
4. studying a grammar rule.
5. deciding how to record new vocabulary.
6. making a mindplan of ideas for a speaking or writing task.
7. repeating a phrase after the teacher or tape.
8. discussing a topic in pairs or groups.