1) Many nations have been faced with the problem of ... 2) Recently the problem has been brought into focus. 3) Recently the phenomenon has become a heated topic. 4) Recently the issue has aroused great concern among ... 5) Nowadays there is a growing concern over ... 6) Never in our history has the idea that ... been so popular. 7) Faced with ..., quite a few people argue that ... 8) According to a recent survey, ... 9) With the rapid development of ...

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