____, Tom. Is this your book —No, it isn’t. I think it’s ____.

Has Jim known the good news—Not yet. I will tell him about it ________ he comes back.

Even though Jack has failed many times in his experiment, he holds a belief________he will succeedone day if he carries on with it. [ ]

You should ____ hard.

joy, Della first earned the trust of herstudents and then _____ of her colleagues.