The conduction band is the energy region where electrons can move freely.

The computer froze, so I restarted it.

The computer has frozen, so it needs to be restarted.

He made a bronze sculpture.

I can't find my mobile phone.

As a campaigner, he is promoting a healthy lifestyle.

He listened to the news with an apathetic face.

He shows an apathetic attitude towards everything.

There is a high school reunion next week.

He is a very active person.