Complete the gaps in the following text using the verbs in brackets in grammatically appropriate tenses. Before it was over, the 20th century 1) (see) many radical changes. Almost every area of human activity 2) (witness) innovations and change before the year 2000. Never before had better knowledge, more effective communication and faster transportation
3) (change) the world so much in those ten decades making it unrecognisable. Nothing of the kind 4) (happen) any time in the past. The 20th century
5) (start) with steam-powered ships and ended with the space missions. By the turn of the century, automobiles already 6) (replace) horses. Later, antibiotics
7) (save) millions of lives. People 8) (read) about lasers first in science fiction and then in newspapers. By its end, World War II 9) (claim) the lives of 60 million people. For a couple of decades people 10) (take) their first small steps into space until they 11)(make) a leap on the Moon surface. Computer technology 12) (make) the whole difference. If a child is asking the parents to buy him or her something as a present, that 13) (be) a computer. Many people now 14) (stand) a good chance of improving their health thanks to technological progress in medicine. Unfortunately people in many countries of the world 15) (come) to know genocide, wars, global warming and other disasters. English 16) (become) the global language. Mankind 17) (achieve) even more by the end of the 21st century but the 20th century will hold its unique place in history forever.

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Before it was over, the 20th century saw many radical changes. Almost every area of human activity witnessed innovations and change before the year 2000. Never before had better knowledge, more effective communication, and faster transportation changed the world so much in those ten decades, making it unrecognizable. Nothing of the kind had happened any time in the past. The 20th century started with steam-powered ships and ended with space missions. By the turn of the century, automobiles had already replaced horses. Later, antibiotics saved millions of lives. People read about lasers first in science fiction and then in newspapers. By its end, World War II claimed the lives of 60 million people. For a couple of decades, people took their first small steps into space until they made a leap on the Moon's surface. Computer technology made the whole difference. If a child is asking their parents to buy them something as a present, that is a computer. Many people now stand a good chance of improving their health thanks to technological progress in medicine. Unfortunately, people in many countries of the world came to know genocide, wars, global warming, and other disasters. English became the global language. Mankind will achieve even more by the end of the 21st century, but the 20th century will hold its unique place in history forever.

Explanation:

1) "saw" - The verb "see" is in the past simple form to indicate an action that happened in the past.

2) "witnessed" - The verb "witness" is in the past simple form to describe an action that occurred in the past.

3) "changed" - The verb "change" is in the past simple tense to demonstrate a completed action in the past.

4) "had happened" - The past perfect tense "had happened" is used to emphasize that this action occurred before the other actions mentioned in the text.

5) "started" - The verb "start" is in the past simple tense to describe an action that happened in the past.

6) "had already replaced" - The past perfect tense "had already replaced" is used to indicate an action that occurred before a specific time in the past (turn of the century).

7) "saved" - The verb "save" is in the past simple tense to indicate an action that happened in the past.

8) "read" - The verb "read" is in the past simple tense to describe an action that occurred in the past.

9) "claimed" - The verb "claim" is in the past simple tense to describe an action that happened in the past.

10) "took" - The verb "take" is in the past simple tense to indicate an action that occurred in the past.

11) "made" - The verb "make" is in the past simple tense to describe an action that happened in the past.

12) "made" - The verb "make" is in the past simple tense to describe an action that occurred in the past.

13) "would be" - The modal verb "would" is used to indicate a hypothetical situation or request.

14) "stand" - The verb "stand" is in the present simple tense to show a general truth or fact about the present.

15) "came" - The verb "come" is in the past simple tense to indicate an action that happened in the past.

16) "became" - The verb "become" is in the past simple tense to describe an action that happened in the past.

17) "will achieve" - The verb "achieve" is in the future simple tense to indicate a future action.