1. _________in space存在于太空
2. _________into a truck撞上一辆卡车
3. _________on the surface of the water漂浮在水面上
4. _________out my tooth拔掉我的牙齿
5. _________of flowers / work一大堆的花 / 工作
6. the law of conservation of_________质量守恒定律
7. in the cold_________在寒冷的气候条件下
8. climb out of the_________爬出宇宙飞船
