Mix Salated - Grammar - Put in the right form

Zitat:
1. For thousands of years man [have asked] (ask) the question "What is time?".
2. Babylonian astronomers [knew] (know) the number of years,

but their priests [insisted] (insist) on 360 days - a magic number.
3. The moon`s cyle [lasts] (last) approximately 29 1/2 days, and the earth`s 365 1/4 days.
4. In 200 million years a day [will last] (last) 25 hours.
5. In the eleventh century a Chinese, Su Song, [made] (make) one of the first mechanical clocks - a water clock.
6. In the sixteenth century Galileo [was sitting] (sit) in a church when he [noticed] (notice) a lantern swinging and [discovered] (discover) the pendulum.
7. Since the 1940s, scientists [have known] (know) that the electrons of atoms oscillate as regularly as a pendulum.
8. For some years scientists [have measured] (measure) time most accurately with atomic blocks.
9. - Hello! BTL Radio Station calling. Can you give me the time, please?
- Just a moment. I [have to check] (check) the atomic clock.
10. Because of Einstein`s theory of relativity we can predict that rapidly moving clock [will tick] (tick) more slowly.
11. Three scientists in California [are going to start] (start) a project to research time travel early next year.
12. Many science fiction fans believe that in a hundred years time, people [will use] (use) time machines to travel back and forth in time.

13. However, most scientists agree that this [will probably not be] (not be) possible.
14. It is likely that most of people you know [are wearing] watches at this moment.
15. Men [did not start] (not start) to wear wrist watches until World War |.
16. The soldiers [found] (find) it difficult then to reach inside their uniform coats to check the time on a pocket watch.
17. Last Thursday I [wanted] (want) to give my mother a watch for her birth-day, but I [had forgotten] (forget) to take my credit card with me when I was shopping on Wednesday.
18. Tomorrow, at 10 a.m, our tour bus [will leave] (leave) for a guided tour of the biggest Seiko watch factory Japan.
19. Even as you read this, 1,150 robots [are assembling] (assemble) watches there.
20. Every two seconds a new watch [comes] (come) off the assembly line.

Zitat:
zu 1: kommt da nicht "has asked" hin aufgrund dem man im Singular?
zu 9: Nimmt man hier nicht eher das Simple Present?