按要求完成下列句子。(20分)
（1）It's about seven__hundred__kilometres．(就画线部分提问)
________ ________is it?
（2）北京有多大？
________ ________is Beijing?
（3）visiting，Daming，is，America(.)(连词成句)
_________________________________________________________________
（4）It's got eight million people.(英译汉)
_________________________________________________________________