两个英语题，求助~

1. Usually, _______ care for children's ______.
A. woman writers... lives B. women writer... life
C. women writers ... life D. women writer ... lives
2. ________ you are free, why not go skating with us?
A. Because B. Since C. As D. For

需要答案以及解释，谢谢各位高人~

1.C Man ，Woman用于修饰名词的时候，两者都要用复数。排除之后，选C

2.B 意思是：既然。