Looking back over the whole affair, I see only one possible course of action.

There were two possible courses of action, as I saw it.

There was much he wanted to say, but under the circumstances silence seemed the only possible course.

"We have to exhaust every possible course of action that will give us more information," he said.

There does seem to be only one possible course of action: We must have further information.

The only possible course now was to gamble everything on becoming king.

Which was beginning to sound like the only possible course of action.

The following is a possible course of action for a school.

Once over the hill, the road offered only one possible course for another mile.

It has prepared us for all possible courses of action.