第1个回答 2012-03-10
As is known to us all , smoking is bad for our health.
This is the house we lived in last year.
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第2个回答 2012-03-10
It is known to us all that smoking is harmful to our health
This is the house we lived in last year本回答被提问者采纳
第3个回答 2012-03-10
As we know,smoking is bad for our health .
第4个回答 2012-03-10
As we all know, smoking is harmful to health
This is the house we lived in last year