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5. As is known man is the product of labour.
6. It is a common saying that man who has a settled purpose will surely succeed.
7. It is clear that the enemy has no desire for peace.
8. It is hard to imagine how Edison managed to work twenty hours each day.
9. It's hard to say whether the plan is practicable.
10. There is no doubt that you will be helped by others if you have any difficulties.
11. It seems certain that they have made a series of experiments.
12. It is said that bats have been using radar for millions of years.
13. To tell the truth , many mistakes we made could have been avoided.
14. As we know, it was not until recently that the problem was solved.
15. It must be admitted that you haven't done what you promised to do.
16. In my opinion, this computer is different from that one you saw.
17. It is certain that we have a long way to go.
18. All this shows that nothing can prevent us from reaching our aims.
19. As far as we know, it took him more than a year to write the book.
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