The of the collision theory was rejected by astronomers. (argue)

We must ensure the of the bridge before crossing. (stable)

His of the truth was quite shocking. (suppress)

The planet was difficult to observe through the telescope. (rotate)

It is to predict exactly where a comet will land. (possible)

The scientist faced situations during his research. (comfort)

The discovery came from an source. (expect)

The of the two vehicles caused significant damage. (collide)

The events happened over a period of years. (recent)

There is no that these geological claims are true. (evident)