It has been the subject of much speculation ever since.

What lay in between was the subject of much speculation.

Just how good a job they can do without him has been a subject of speculation.

The company became the subject of speculation about being taken over itself at the time.

It has also been the subject of much speculation as to why this is.

China's defense budget, a subject of great speculation, is probably around $30 billion and growing by 10 percent each year.

In the end, the risk, which had been the subject of much speculation, seemed worth taking.

The list has always been the subject of much media attention and public speculation.

They were the subject of much speculation at the time.

By later today, he'd no doubt be the subject of much speculation.