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。
They were playing _________ ( 吵闹 ) outside.
It has been in _________ ( 服务 ) since 2000.
Have you ________(意识到) this serious mistake now, guy?
_______ ( 闪电 ) started a big fire in a house.
The _________(政府) has taken action to prevent people cutting down the trees.