Заполните пропуски, выбрав правильную грамматическую форму. 1.the simplest digital device is any device which [a) can; b)could; c)must] count. 2.in ancient days man [a) learns; b) learned; c) has learned] to substitute beads for fingers to help him count. 3.the ancient chinese simplified the [a) counted; b) to count; c) counting] board into abacus. 4.the japanese improved the abacus making it [a)more efficient; b)much efficient; c)efficienter]. 5.the tremendous speeds of computers and the flexibility [a) building; b) built; c) to build] into them [a) because of; b) according to; c) due to] the logical control make modern computers more powerful than mechanical calculators. 6.the big problem in understanding digital computers is the logic which relates the logical elements into a unit [a)performed; b) performing; c) having performed] arithmetic and logical operations. 7.arithmetic operations [a) converted; b) are converted; c) was converted] into a sequence of simple logical operations. 8.any digital calculation is usually [a) breaking; b) broken; c) being broken] down into a sequence of elementary operations. 9.a computer is a device [a) to accept; b) has accepted; c) accepts] a set of instructions and [a) executes; b) executed; c) to execute] them in the appropriate sequence. lo.the flip-flop [a) is; b) was; c) has been] a storage cell with two inputs and two outputs.

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