Separation of Substances

Fill in the blanks with appropriate words:
(i) Small pieces of stone can be removed from rice by__________.
(ii) ___________ are obtained from stalks by threshing.
(iii) Husk from wheat flour is generally removed by__________.
(iv) The process of settling of heavier particles is called__________.
(iv) Filtration is helpful in separating an insoluble __________from a __________.