1£®What is the problem with...?

2£®Nowadays, there exists a serious social/economic/environmental problem...¡¡

3£®With the development of the modern technology£¬private cars are popular with ordinary people.

4£®Not only has the air been polluted£¬but also traffic accidents have increased greatly.

5£®It is well known that the main cause of road accidents is drunk driving and speeding.

6£®What is the solution to the problem?

7£®There are reasons for...First of all£¬...Secondly£¬...Thirdly£¬...

8£®In view of...£¬measures must be taken to solve this problem.

9£®We should think of ways to solve the problem.

10£®It is high time for...to do...