1） recently the problem of…has aroused people’s concern.
2） recently the problem of…has been brought to public attention
recently，the problem of二has been brought into focus.
4）man is now facing a big problem一（pollution），which is becoming
more and more serious.
5) have you ever thought of．，．？
6）there will surely be no agreement among people as to the issue whether…
7）（internet）has been playing an increasingly important role in our day-to-day life. it has brought us a lot of benefits but has createdsome serious problems as well.
8) one of the serious problems facing us at present is…目前，我們
面臨的嚴重問題之一是，二
9) there has been a heated argument about whether...
10）perhaps we need to reconsider the traditional ways of doing it，
11）it is generally agreed that…is in deep trouble.
12）it is only during the last few years that man has become generally aware of the importance of (sustainable development)
13）everyone is aware of the horrible fact：
14）it’s difficult to imagine now how we did something without…
15）along with something goes with something. inevitably，the two are deeply intertwined.
16）over the past decade，many people have been troubled with the serious problem of...
17) one of the pressing problems confronting us today is...
18) one of the hottest topics many people talk about now is. . .
19）now people become increasingly aware of the necessity of.，．
20）no issue is more important now than the one that...（which）is commonly held by most people.
21）in spite of great progress made in the field of．，．，but.．，remain basically unchanged.
22）there will often spring up a heated discussion as to...
23）（independence）has become a hot topic among people，especially among the young，and heated debates are right on their way
24）nowadays，（overpopulation）ha、become a problem we have to face．
25 ）it is commonly believed that.，．
1) 2）it is a common belief that if...
2) it is held by some people that.．．
3) 4) it is universally acknowledged that. .
4) when it comes to．…，most people believe that..
5) there is often an assumption that. . .
6) it is increasingly recognized by the general public that.
7) it has been accepted without question for a long time that..
8) it has been taken for granted that..
9) ) many people insist that. ..
11）a commonly accepted rule of doing something is that...
12）with the development of science and technology，more and more people believe that..
13）in a world that’、growing more and more（competitive）…，the ability to do something has never been more important.