Выберите 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.

1. The simplest digital device is any device which can count.

2. In ancient days man learned to substitute beads for fingers to help him count.

3. The ancient Chinese simplified the counting board into an abacus.

4. The Japanese improved the abacus, making it more efficient.

5. The tremendous speeds of computers and the flexibility built into them due to 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 performing arithmetic and logical operations.

7. Arithmetic operations are converted into a sequence of simple logical operations.

8. Any digital calculation is usually broken down into a sequence of elementary operations.

9. A computer is a device that accepts a set of instructions and executes them in the appropriate sequence.

10. The flip-flop is a storage cell with two inputs and two outputs.