31.   What if the outside world was unaware of what was happening at Heymouth?

32.   Most burglaries happen at night.

33.   The incident happened at a critical point in the campaign.

34.   She began to rack her brains to remember what had happened at the nursing home.

35.   What was happening at that particular moment in time?

36.   What happened at school today?

37.   Fortunately the cut happened at night and power was restored before any noticeable pollution took place.

38.   Look what had happened at the last seance.

39.   Anything could happen at any time.

40.   What has been happening at Warwick since we bought the company?