I just keep working hard as I have done, and ________ it will pay off. It has done so far and so I just have to do the same.

He had promised me to come to the party, and _____.

In order to avoid something unpleasant, everyone present should stick to the agreement___________. 

In the bubble years, lending standards slipped ______,allowing   many people to put far too much of their income into paying for their housing.

—Have you finished your project, Alice? —I’m afraid I       forgot about it.