Smart shoes that adjust their size throughout the day could soon be available. A prototype of such a shoe has already been produced and a commercial (i) _____ may be in production within a few years. The shoe contains sensors that constantly check the amount of (ii) _____ left in it. If the fool has become too large, a tiny valve opens and the shoe expands slightly. The entire control system is about 5mm square and is located inside the shoe. This radical shoe (iii) _____ a need because the volume of the average foot can change by as much as 8% during the course of the day. The system is able to learn about the wearer’s feet and build up a picture of the size of his or her feet throughout the day. It will allow the shoes to change in size by up to 8% so that they always fit (iv) _____. They are obviously more comfortable and less likely to cause blisters. From an athlete’s point of view, they can help improve performance a little, and that is why the first use for the system will find a place in other household items, from beds that automatically change to fit the person sleeping in them, to power tools that (v) _____themselves to the user’s hand for better grip. There is no reason why the system couldn’t be adapted for use in hundreds of consumer possessions.
(i)_____
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