1. Recently, the problem of ... has aroused people's concern.
2. has been playing an increasingly important role in our daily life.
3. It has brought a lot of benefits but has created some serious problems as well.

1. On the contrary, there are some people in favor of... At the same time, they say ...
2. But I don't think it is a very good way to solve ... For example, ... Worst of all ...
3. is necessary and important to our country's development and construction. First, ... What's more, ...Most important of all, ...

1. Taking all these factors into consideration, we finally come to the conclusion that ...
2. Taking into account all these factors, we may reasonably come to the conclusion that ...
3. Hence / Therefore, we'd better arrive at the conclusion that ...

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