1. In the countries where bike helmets are compulsory there has been no reduction in bike injuries whatsoever.

2. Military service is compulsory for most here, and there is huge sympathy for the armed forces.

3. She also called for compulsory digital citizenship classes in schools.

4. The emails warn potential victims of irregular activities on their account and say a compulsory security update is required.

5. He noted that there was no smoking and compulsory religion classes.