一些高中英语知识（涉及状语从句）麻烦解释下理由

一些高中英语知识（涉及状语从句）麻烦解释下理由
1、we'll have to finish the job,______.
A,long it takes however B,it takes however long
Clong however it takes D,however long it takes
2._______Mother will wait for him to have dinner together.
A.however late is it B.however he is late
C.however is he late D.however late he is
3.We like the oil painting better______we looked at it.
A.as B.while C.the moment D.the more
4.By next Saturday Tom _____a whole month without smoking a cigarette.
5.Please give me a ring _____late you get home
A.whatever B.however C.whenever Dwhoever
6.The meal will take about an hour.____,relax and have a drink
A/in the meantime B.However C.As a result D whenever
7._____way you take,you can't get there
A.no matter B no matter whichever
C.which D.whichever
要理由
要是都给我讲明白了 我追加100分!