(2014·湖南六校联考)I know it’s normal for such a thing to happen，but we________it if we’d been more careful.

—— Do you think he will do me a favor? —— As far as I know, he is the last one to help others. He＿＿＿＿be prepared to give you a hand, though. 

—Shall we finish the project two days ahead?—I’m afraid we       , in case the heavy storm comes suddenly.

I suggest that he _____, or else he could make things worse.

–My sister hasn’t received any reply from the company yet, so she wants to give up. -- My advice is that she _____ till next week.