单句改错(每句均有一处错误)。

( ) 1. I have bought the bike for half a year.

(     ) 2. This long river runs across my village.

(     ) 3. We have written these reports since nine hours this morning.

(     ) 4. This is very nice of you to say so, Many thanks.

(     ) 5. People all over of China got to know the good news.

养鸡专业户李伯伯要靠长30米的墙新建一座鸡舍，这座鸡舍长23米，宽15米，那么鸡舍怎样建最省材料，此时它的周长是多少米？（画图表示）