根据汉语意思写单词

1. The little dog is very sad, because it can't find its ________ (主人).

2. The girl in a ________ (马尾辫)over there is my sister.

3. When you want to get a job from a company, you should give them your ________ (简历).

4. Tom is a ________ (有礼貌)boy. He always says "hello" to his teachers.

5. I want to play tennis with my friends, but I can't find my ________ (球拍).

今年世界各国频发地震。为防止震后疾病传染须对饮用水源进行处理，采取的措施有①煮沸；②消毒；③过滤；④自然沉降，合理处理的顺序是（）。

A.③①②④

B.②④③①

C.④③①②

D.④③②①