Use the word at the end of each gap to form a new word with which to fill the gap: 
‘It is simply this. That Space, as our __(1)___ (MATH) have it, is spoken of as having three dimensions, which one may call __(2)___ (LONG), Breadth, and __(3)___ (THICK), and is always definable by __(4)___ (REFER) to three planes, each at right angles to the others. But some philosophical people have been asking why THREE dimensions ___(5)__ (PARTICULAR) - why not another direction at right angles to the other three?-and have even tried to construct a Four-Dimension geometry. Professor Simon Newcomb was expounding this to the New York Mathematical Society only a month or so ago. You know how on a flat surface, which has only two dimensions, we can represent a figure of a three _(6)____ (DIMENSION) solid, and _(7)____ (SIMILAR) they think that by models of three dimensions they could represent one of four-if they could master the perspective of the thing. See?’
(6)..................

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