They wouldn’t let us through without examining our passports very carefully,_______?

If you keep on working hard, you are sureto in your career.

I can hardly imagine the difficulty she had ______enough evidence to prove that she was innocent

Perhaps I’m not quite fit for the job, but________, please let me have a try[ ]

It is rather cold here. Shall we light a fire? —— No, we＿＿＿＿＿＿because things are easy to catch fire.