He was most active from the late 1970s to the early 1990s.

The group was most active during the late 90s and two years of 2000.

He was the most active between the late 1980s and early 2000s.

They were after all the most active members, including myself.

The most active thing he did was to call for a foreign policy question.

He was among the most active ones in the media.

The group was most active both live and on record during this period.

They eat almost anything and are most active in the dark.

The system began in 1849 but was most active earlier this century.

Visit during the morning when children are the most active.