1.   Cases of detention without trial were common in the last century.

2.   Claims of plagiarism are common in the movie business.

3.   Definitely is more common in spoken English than certainly?

4.   Incredible as they seem, these events certainly took place.?

5.   Delinquency and drug addiction are more common in areas of high unemployment.

6.   Dust storms are relatively common in the Sahara.

7.   Fog and rain are common in the mountainous regions near the border.

8.   Fog and rain is common in the mountainous regions near the border.

9.   Foxes are common in the area.

10.   Interracial Marriages are common in England these days.