根据汉语提示完成下列句子。

①His illness_________（由于）eating contaminated food.  

②The accident_________（导致）the death of two passengers.  

③The machine is_________（成果）of his studies. 

④It doesn't often rain in summer here._______（因此） we have to water the vegetable garden.  

⑤____________（由于下雨），he was late for school.

微型计算机的硬件系统包括主机和外设。