My sister is ten years old and my brother is eleven.(改为同义句）&

My sister is ten years old and my brother is eleven.(改为同义句）
My sister is . .my brother.
2.The population of Shanghai is 13 million.(改为同义句）

Shanghai . . . .13 million.
3.The buildings in New York are taller than the buildings in Washington,D.C.(用一个词替换than后面的'the bulidings'
The buildings iin New York are taller than .in washingtong,D.C.