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35. From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.

A. when 　　　　　　　　　　　　　　 B. until　　　　　　　　 C. since　　　　　　　　　　　 D. before

34. _____ unemployment and crime are high, it can be assumed that the latter is due to the former.

A. Before　　　　　　　　　　　　　　 B. Where 　　　　　　　　　 C. Unless　　　　　　　 D. Until