After the first report, the Firestone response to the station grew tougher.

Since the mid-1980's, when Canada emerged as a force on the world lentil market, times have grown tougher.

But the vote on Monday suggested that the climb might have grown tougher.

Life was growing tougher for the speedy colt on another front as the big field continued to take shape.

He felt himself growing tougher, harder, leaner all the time.

Being left alone by her parents to fend for herself, she has grown tougher and more independent.

A relatively small number of plant species survived, which grew smaller and tougher with passing time.

The negotiations started tough, and then as Garry got his first taste of blood, they grew tougher.

But the task of economic policy makers is likely to grow tougher because living standards are expected to decline before they get better.

If anything, the stance of the insurance interests that have blocked a bill has grown tougher in recent weeks.