请各位高手给做一下下面这两道选择题，并告诉我你所选答案的原因，谢谢！
1.____leaves the room last should remember to turn off the light.
A.Whoever B.No matter who

2.____that my head had cleared,my brain was also beginning to work much better.
A.For B.Now C.Since D.Despite

1.__A__leaves the room last should remember to turn off the light.
A.Whoever B.No matter who
whoever引导的名词性从句，连代whoever可以引导名词性从句，在从句中作主语，也就是any person who或The person who
2.__B__that my head had cleared,my brain was also beginning to work much better.
A.For B.Now C.Since D.Despite
now that:既然
原因状语从句，由because, as, since或复合连接词now that，in that等引导。for是连词，可以表示因为，但其后所接的是并列句中的一个独立句，而非从句。