Keyword Analysis & Research: should i use yours faithfully or sincerely

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
should i use yours faithfully or sincerely	1.37	0.5	8714	42	42
should	1.69	0.4	4423	24	6
i	1.04	0.4	9949	53	1
use	1.8	0.2	8025	26	3
yours	0.2	1	1162	20	5
faithfully	0.03	0.1	3594	13	10
or	0.98	0.1	5578	66	2
sincerely	0.05	0.3	2687	24	9

Keyword	CPC	PCC	Volume	Score
should i use yours faithfully or sincerely	0.08	0.7	1624	9
when to use faithfully or sincerely	1.17	0.8	7663	16