11.   Many accidents are caused by young or inexperienced drivers.

12.   The accident inquiry revealed that the accident had been caused by human error.

13.   The aim of the inquiry was to determine what had caused the accident.

14.   The circumstances which combined to cause this accident were unforeseeable.

15.   The ice and poor visibility caused minor accidents all over the country.

16.   The report concluded that the accident was caused by human error.

17.   The report of the review board concludes unequivocally that the accident was caused by a high-altitude aerial explosion of an asteroidal body.

18.   There are conflicting views about what caused the accident.

19.   They caused lethal accidents, made noises at the wrong time, and froze when action was required.