4. Fill in each blank with a word chosen from the list below to complete the meaning of the sentence:
chip, speed, figure out, calculating, reduces, microminiaturization, analog,
logarithm, abacus, machine, vacuum tubes, tiny, dependable, devised
1. The very first device used was 10 fingers of a man’s hand.
2. Then, the was invented.
3. J. Napier a mechanical way of multiplying and dividing.
4. Henry Briggs used J. Napier’s ideas to produce .
5. The first real calculating appeared in 1820.
6. This type of machine the possibility of making mistakes.
7. In 1930 the first computer was built.
8. This was the first machine that could mathematical problems at a very
fast speed.
9. In 1946 was built the first digital computer using parts called .
10.The reason for this extra was the use of transistors instead of vacuum tubes.
11.The second generation computers were smaller, faster and more than firstgeneration computers.
12.The third-generation computers are controlled by integrated circuits.
13.This is due to , which means that the circuits are much smaller than before.
14.A is a square or rectangular piece of silicon, usually from 1/10 to 1/4 inch

1. The very first device used was 10 fingers of a man's hand.
Answer: fingers.
Explanation: The sentence is talking about the first device used by man, which was his own fingers. The word "fingers" completes the meaning of the sentence.

2. Then, the abacus was invented.
Answer: abacus.
Explanation: The sentence is stating that after using fingers, the abacus was invented. The word "abacus" completes the meaning of the sentence.

3. J. Napier devised a mechanical way of multiplying and dividing.
Answer: devised.
Explanation: The sentence is talking about how J. Napier came up with a mechanical way of multiplying and dividing. The word "devised" completes the meaning of the sentence.

4. Henry Briggs used J. Napier's ideas to produce logarithm.
Answer: logarithm.
Explanation: The sentence is stating that Henry Briggs used J. Napier's ideas to produce something related to mathematics, which is a logarithm. The word "logarithm" completes the meaning of the sentence.

5. The first real calculating machine appeared in 1820.
Answer: calculating.
Explanation: The sentence is talking about the first real machine used for calculating, which appeared in 1820. The word "calculating" completes the meaning of the sentence.

6. This type of machine reduces the possibility of making mistakes.
Answer: reduces.
Explanation: The sentence is stating that this type of machine decreases or lessens the likelihood of errors. The word "reduces" completes the meaning of the sentence.

7. In 1930 the first computer was built.
Answer: computer.
Explanation: The sentence is stating that in 1930, the first computer was constructed. The word "computer" completes the meaning of the sentence.

8. This was the first machine that could calculate mathematical problems at a very fast speed.
Answer: fast.
Explanation: The sentence is describing that this machine had the ability to solve mathematical problems rapidly. The word "fast" completes the meaning of the sentence.

9. In 1946, the first digital computer using parts called vacuum tubes was built.
Answer: digital.
Explanation: The sentence is stating that in 1946, the first computer that used vacuum tubes and worked with discrete digits (binary code) was constructed. The word "digital" completes the meaning of the sentence.

10. The reason for this extra speed was the use of transistors instead of vacuum tubes.
Answer: transistors.
Explanation: The sentence is explaining that the reason for the enhanced speed was the replacement of vacuum tubes with transistors. The word "transistors" completes the meaning of the sentence.

11. The second-generation computers were smaller, faster, and more dependable than first-generation computers.
Answer: dependable.
Explanation: The sentence is describing that second-generation computers were more trustworthy and reliable compared to first-generation computers. The word "dependable" completes the meaning of the sentence.

12. The third-generation computers are controlled by integrated circuits.
Answer: integrated.
Explanation: The sentence is stating that third-generation computers are regulated or managed by integrated circuits. The word "integrated" completes the meaning of the sentence.

13. This is due to microminiaturization, which means that the circuits are much smaller than before.
Answer: microminiaturization.
Explanation: The sentence is explaining that the reason behind the smaller circuits is microminiaturization, which refers to the process of making things extremely small. The word "microminiaturization" completes the meaning of the sentence.

14. A chip is a square or rectangular piece of silicon, usually from 1/10 to 1/4 inch.
Answer: chip.
Explanation: The sentence is defining what a chip is - a small piece of silicon with specific dimensions. The word "chip" completes the meaning of the sentence.