The Fifth Element is a very moving film. I ______ it many times already. [ ]

A.will see

B.see

C.saw

D.have seen

①MgCl₂ ②干冰③冰 ④Na₂O₂ ⑤白磷（P₄）⑥硫磺 ⑦Na₂CO₃ ⑧金刚石   ⑨NaOH ⑩SiO₂

(1)以上物质中属于离子晶体的是         ；

(2)属于分子晶体的是           。

(3)属于原子晶体的是_________（填序号）