I told Sally how to get here, but perhaps I ______for her.

You __________be tired—you’ve only been working for an hour.

—I’m afraid you missed a fantastic lecture yesterday. How come you were absent from it?
—If you _______ know, I asked for a day off and visited a relative of mine in hospital.

Why _______ you be so stubborn? You should think over my advice on this matter.

Keep up a good state of mind even if you ______ fail plenty of times.

Lora，you ____________ leave all your books on the floor like this!

— It’s no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can’t agree with you more. There ________ be errors for every single step.

--My computer ____start, no matter how hard I try.
--It might have crashed.

—What did you say to your sister? I saw her crying in the room.
— It _________ my fault. I just said hello to her when I met her, nothing else.

—The deadline is drawing, but I failed to challenge the task a third time.
— ______ my brother have a try?