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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