魏老师将两张刚制好的永久装片和两种写明“球形细菌”和“酵母菌”的标签交给你．请你借助电子显微镜下的观察正确地贴好标签．你的依据是（　　）

A．叶绿体的有无

B．细胞壁的有无

C．遗传物质的有

D．细胞核是否成形

根据括号中所给的汉语，写出单词的正确形式，使句子意思完整。

小题1:They were playing _________ ( 吵闹 ) outside.

小题2:It has been in _________ ( 服务 ) since 2000.

小题3:Have you ________(意识到) this serious mistake now, guy?

小题4:_______ ( 闪电 ) started a big fire in a house.

小题5:The _________(政府) has taken action to prevent people cutting down the trees.