The reason why I have to go is _____ if I don’t

I can’t do the job ______ you. Maybe you can help me.

TheTV is too noisy, would you mind alittle, please–Sorry,I will do it right away.

Hi, Steve, have you finished your book report—Not yet. I haven’t decided which book _________.

I find ________ hard for me ________ the work in such a short time.—I’m afraid not, but you can try your best to do it.