根据短文内容，完成下列各题。

We Both Like Music

    My name is Frank White. I'm fourteen years old. I was born on May 13th, 1999. Mike is my good friend. His birthday is May 15th. He is only twelve years old now. Every year on May 14th, we have a birthday party together(一起) at our school. Many friends come to our party. We all have a good time at the party. We both like music. We often have a pop concert. I play the guitar. He plays the drums. Mike often sends me some CDs and I often send him tickets for concerts.

宜春樟树“四特酒”素有“三杯下肚浑身爽，一滴沾唇满口香”的赞誉，它的包装盒上标明容量500mL．（ρ_酒=0.9×10³kg/m³），则它装满酒的质量为　 ____　kg；如果用此瓶装满水，则总质量比装满酒时多　 ____　g．