要保持环境空气的清洁、新鲜，下列措施中不适宜的做法是

A．经常喷洒杀虫剂，将空气中的细菌杀死

B．经常保持室内空气的流通，减少室内微生物的含量

C．注意绿化环境，利用绿色植物净化空气

D．经常打扫环境和房间，保持环境卫生和个人卫生

---All the oil in the world will have __________ some day.

---Yeah. What shall we use for power at that time?

A．given away

B．put away

C．run out

D．set out