1. 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. Mountaineers carry oxygen with them, while climbing high mountains.