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 **** shows the __ in which the a6ir is moving at that place.
(d) Mountaineers carry oxygen __ with them, while climbing high mountains.
