1. It i (ha been) etimated that the world' population could reach 6 billion by the end of the century.
2. It mut be pointed out that it i one of our baic State policie to control population growth while raiing the quality of the population.
3. Upon hearing the unexpected new, he wa o urpried that he couldn't utter a word.
4. It' hard to ay whether the plan i practicable.
5. It mut be kept in mind that there i no ecret of ucce but hard work.
6. A the aying goe, nothing in the world i difficult for one who et hi mind to it.
7. A i known man i the product of labour.
8. It can be een from thi that there i no difficulty in the world we can overcome.
9. It eem certain that they have made a erie of experiment.
10. It mut be admitted that you haven't done what you promied to do.
11. It i certain that we have a long way to go.
12. It i clear that the enemy ha no deire for peace.
13. It i hard to imagine how Edion managed to work twenty hour each day.
14. There i no doubt that you will be helped by other if you have any difficultie.
15. It i aid that bat have been uing radar for million of year.
16. To tell the truth, many mitake we made could have been avoided.
17. A we know, it wa not until recently that the problem wa olved.WWw.hAOzuowEn.com
18. In my opinion, thi computer i different from that one you aw.
19. All thi how that nothing can prevent u from reaching our aim.
20. A far a we know, it took him more than a year to write the book.
21. It ha been proved that every ubtance, no matter what it i, made up of atom.
22. To be frank, whether you like it or not, you have no other choice.
23. It ha been decided that we are going to build a railway whoe bae mut be completed within thi year.
24. Frankly peaking, what you call the truth may not apply to thing happening here.
25. It i obviou (evident) that the ucce of the innovation depend on our concerted effort.
26. It i natural that one may have trouble expreing complicated idea in imple Englih.
27. We will be ucceful a long a we perevere.
28. What i more important, the agreement they have negotiated i being carried out.
29. It i true that we mut redouble our effort; otherwie we cannot catch up with the developed countrie.
30. I take it for granted that they will upport thi idea. I regard it a natural that they will agree to thi idea.
31. In a certain ene, a ucceful cientit i a peron who i never atified with what he ha achieved.
32. It i a common aying that man who ha a ettled purpoe will urely ucceed.
33. The ocean do not o much divide the world a unite it.
34. It can be aid that without knowledge of cience and technology, it i impoible to build ocialit modernization.
35. There i no denying the fact that the new management method ha greatly increaed the production.
36. Now in China, more and more familie can afford to buy high-grade good, uch a wahing machine, TV et, videocorder.