valid

The bus pass is valid for 30 days.

available

Tickets for the film are available from the box office.

aware of

Smokers should be aware of the danger to their health caused by smoking.

frequent

There is a frequent bus service to the town centre.

adequate

Many people in developing countries do not have an adequate supply of fresh water.

reasonable

The prices in that restaurant are reasonable.

sufficient

We do not have sufficient time in the test to write two essays.

previous

The car is second-hand. It had one previous owner.

subsequent

The population stood at 10 million in 1980. In subsequent years, it rose sharply.

prior

Some prior knowledge of computers is required for this job.