He announced his marriage.

He completely gained control of the robot.

He can completely control that robot.

A big cheer went up from the audience when he appeared.

I think that price is reasonable.

That job suits his suitability.

This new system enables efficient business operations.

This library is very quiet.

The quietness of this library provides an ideal environment for concentration.

After years of hard work, he was finally able to achieve great success.