I don't mind _____ if he doesn't come

I don't mind _____ if he doesn't come [Since,If]he doesn't come,I won't come[too,either].He asked I do not mind if you hate me.It doesn't matter at all.I don' I don't know if he will come tomorrow. I don′t know if he come this afternoon I don't know if he ____ ( come ) I don't know if he ___(come) tomorrow.If he ____(come),I'll I don‘t think he is tall,_____?He doesn't think he is tall,_ if he doesn't do it ,i---- A.don't ,either B.won't,either C. I don't know if he will come tomorrow i think he if he free I will come( )I don't change my mind.A.if B.unless 求一道高考题：I don't care ------ he doesn't come(错误）