--Will you be__________ tonight, Mary?--It depends. I’m afraid I’ll be called in by my manager.
________ the problem, he wouldn't have committed those mistakes.
________ I be free tomorrow, I would go with you.
If he ________ my advice, he wouldn't have lost his job.
This printer is of good quality.If it ________ break down within the first year,we would repair it at our expense.
Maybe if I ________ science,and not literature then,I would be able to give you more help.(2011·北京)