Such a challenge would appear to be an uphill one.

In this specific instance, no such challenges appeared to have been brought.

Several major challenges to capitalism appeared in the early part of the 20th century.

But today's challenge appeared to be aimed at the wavering Democrats.

Just appearing every morning on time is a challenge for some of the program's graduates.

Now, 90 days later, the computer industry's bold challenge appears to be running out of steam.

But a challenge to his authority a few months later appeared to re-energise him.

Of course, it is only normal that new challenges are appearing for the future.

Since 1998, another major challenge has appeared: the war in Kosovo.

But a challenge to the city's power to condemn appears to be unlikely.