3.However,_________.

2.It is certain that________.

1.Nowadays,there is a growing concern on_______.

12.All in all,_________.

问题解决型模板三

11.Thirdy,__________.

10.Secondly,_________.

9.That is because_______.

8.So it is high time for us to_______.

7.Last but not least,________.

6.Further more,_______.