In the following passage, one word has been omitted in each line against ehich a blank is given.Write the missing word along with the word that comes before and the word that comes after.

cowrie shells, are shells of a (a)...........

mollusc that widely found in (b)...........

the shallow waters the pacific (c)..........

and indian oceans,are most (d)..........

widely longest used currency in (e)..........

history.these shells first (f)............

used currency in china.In fact, (g)............

a cowrie shell originally represented

the chinese character 'money'. (h).............