After spending hours working on this project, I'm running ....—can we take a break?

I'm .... of doing my boss's errands. If something doesn't change soon, I'm going to quit!

There will always be people ready to jump .... and start classes in whatever is fashionable.

The boss hit .... when he saw that we'd overspent.

Lack of willingness to compromise on both sides is the main ..... block to reaching a compromise.

The whole town is protesting the plans to build a new shopping center, so the proposal is .... air now.