Nick was __ _to talk with me last night, so I had no idea about the progress of the project

I always help my sister _________ her history.

I have been told to donate blood by the health expert __________ I need some in the medical treatment one day.

Would you like to go to the concert with us tonight–I’d love to, ________ I can’t. I have a lot of homework to do.

______ disappointed us most was that the guide wasalways asking us to leave ____ we thought very interesting.