11、Recently， the problem of … has aroused people’s concern.

　　最近，…问题已引起人们的关注。

　　12、Internet has been playing an increasingly important role in our day-to-day life. It has brought a lot of benefits but has created some serious problems as well.

　　互联网已在我们的生活中扮演着越来越重要的角色。它给我们带来了许多好处，但也产生了一些严重的问题。

　　13、Nowadays，(overpopulation) has become a problem we have to face.

　　如今，(人口过剩)已成为我们不得不面对的问题了。

　　14、With the development of science and technology， more and more people believe that…

　　随着科技的发展，越来越多的人认为…

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