1. It must be pointed out that it is one of our basic State policies to control population growth while raising the quality of the population.
2. It must be kept in mind that there is no secret of success but hard work.
4. It is hard to imagine how he managed to finish the work in such an efficient way.
9. It is hard to say whether the plan is practical.
10. It must be admitted that you haven’t done what you promised to do.
12. It is obvious (evident) that the success lies in our devotion and efforts.
13. It is natural that one may have trouble expressing complicated ideas in simple English.
15. It is a common saying that man who has a settled purpose will surely succeed.
开篇
1) With the rapid development of the society and China’s entry into WTO…
2) According to above-mentioned passage…
3) Recently the phenomenon has become a heated topic.
4) Recently the argument has aroused great concern among ...
5) Nowadays there are a growing number of people who tend to …
6) There is an increasing number of expert who hold the opinion that…
9), ... Many nations have been faced with the problem of ...
结尾。