1. It must be pointed out that it is one of our basic State policies to control pulation growth while raising the quality of the population. 4w|t|?
2. It is (has been) estimated that the world's population could reach 6 billion by the end of the century. Z[[*:9rY|
3. It must be kept in mind that there is no secret of success but hard work. M
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4. It can be seen from this that there is no difficulty in the world we can overcome. ;4-$C =&
5. As is known man is the product of labour. An>ai N]
6. It is a common saying that man who has a settled purpose will surely succeed. h)sT37
7. It is clear that the enemy has no desire for peace. Wk^{Tn/]
8. It is hard to imagine how Edison managed to work twenty hours each day. U}HSL5v
9. It's hard to say whether the plan is practicable. ~c&sr5E
10. There is no doubt that you will be helped by others if you have any difficulties. J|jvqt9C
11. It seems certain that they have made a series of experiments. bkR~>F]FAu
12. It is said that bats have been using radar for millions of years. y)LX?d
13. To tell the truth , many mistakes we made could have been avoided. yLqhj7
14. As we know, it was not until recently that the problem was solved. F+VNrt-
15. It must be admitted that you haven't done what you promised to do. k ]gPMhe
16. In my opinion, this computer is different from that one you saw. vC&0UNe$
17. It is certain that we have a long way to go. m%eCTpYo
18. All this shows that nothing can prevent us from reaching our aims. 3,Z;J5VL4!
19. As far as we know, it took him more than a year to write the book. `B&