---- Pity you missed the lecture on nuclear pollution. ---- I _________ it, but was busy preparing for a job interview.

Although this ____ sound like a simple task, great care is needed.

--- Have you told him we have changed the plan?I _____ have, but I haven’t done it yet.

 I insisted that a doctor        immediately.

Maybe if I _______ literature, but not science then, I would be able to give you more advice now.