31.   According to custom, the festivities begin at dusk.

32.   By tradition, the celebration begins at midnight.

33.   At college she began consorting with drug users, eventually becoming an addict herself.

34.   His interest in drama began at a very young age.

35.   The age at which children begin to acquire linguistic skills.

36.   A further recount began at the end of May.

37.   Shevardnadze would continue in office until his resignation was considered by the Supreme Soviet at its next session, beginning at the end of December.

38.   The talks beginning at the end of April were described as useful.

39.   Ironical groans began at that.

40.   This attention to detail begins at the initial planning stage when Kate will work with the architects and engineers on the proposed layout.