Sulphur has occasionally been found in the earth in an almost pure state．

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regularly accidentally sometimes successfully

finally immediately occasionally certainly

sulphur; walnut; urea sulphur; urea; walnut urea; sulphur; walnut walnut; urea; sulphur

regularly constantly occasionally frequently

regularly accidentally sometimes successfully

regularly accidentally sometimes successfully

regularly accidentally sometimes successfully

That’s because It’s no wonder that There’s no doubt if It’s unlikely that

finally　 immediately occasionally　 certainly

sulphur；walnut；urea sulphur；urea；walnut C. urea；sulphur；Walnut walnut；urea；sulphur

regularly constantly occasionally frequently

finally immediately occasionally certainly

regularly accidentally sometimes successfully

regularly accidentally sometimes successfully

regularly accidentally sometimes successfully