1:Some architect have an irresponsible attitude towards their career.
attitude towards sth.= attitude to sth.意思是对待某事的态度……
2:The road was just completed one month ago,but one month later,it was closed because it was repairing.
时间+ago 是过去时态的标志词,because of 是一个介词短语,后面不能给一个完整的句子,如果要用一个完整的句子应该用because来表示原因或者用since或as都可以.