A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements

Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders.


(a) The ______ makes the windmill rotate.


(b) Air is a ______ of some gases.


(c) A weather cock shows the ______ in which the air is moving at that place.


(d) Mountaineers carry oxygen ______ with them, while climbing high mountains.


(a) Wind


(b) Mixture


(c) Direction


(d) Cylinders


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