If someone falls off the ladder and gets seriously hurt, you’d better leave him _____ he falls and try to get help.

You have failed to do what you ________ to and I’mafraid the teacher will blame you.

I find it difficult for me_______ my English homework after class.

so much work to do, I don’t think I cantake it any more.—______. Things will get better.

Tom was about to close the windows ______ his attention was caught by a bird.