Read the following passage and choose the best answer for each blank.
In school boys and girls study math. Counting, adding, subtracting, multiplying, and dividing are parts of (81)______what they learn. Schools teach (82) ______because it plays (83)______ an important part in our lives. How could we do such things (84)______ figure time, make a change, build houses, or even keep score for a game without knowing (85)______ numbers? Simple (86)______with numbers, or arithmetic, is one branch of mathematics. Among the many (87)______ branches are geometry, algebra, trigonometry, and calculus. Mathematics has grown (88)______ the need for it has grown. Geometry has to (89) ______mostly with form – with (90)______ things angles, triangles, circles, and spheres. Algebra is a sort of mathematical (91)______. By using algebra we can state many mathematical ideas with just (92) ______letters and signs. If we want to say, for example, (93)_______ in any circles the (94)______ is twice the radius we can write: D = 2r. Gradually other branches of mathematics (95)______ added. Mathematics today (96) of great use to (97) ______other sciences. Mathematics, however, is much more than a tool. It is a way of thinking – of drawing conclusions (98)_______ facts. One (99)________advance in mathematics is the building of great electronic computers or calculating machines. In a few seconds, a computer can (100)________ problems that might take a man years to solve alone.
91__________
