4. You look so detached. What______ you_____________ \(think\) about? – I_____________ \(think\) about those words of Jane’s. I ___________________\(think\) about them all day long and I still___________________ \(not understand\) what she meant.

• are / thinking / think / am thinking / do not understand
• are / thinking / am thinking / have been thinking / do not understand
• do / think / am thinking / have been thinking / do not understand