He is in his sixties ,( ) he has made up his mind to leave h

He is in his sixties ,yet he has made up his mind to leave his son .
他已经60岁多了,他下决心留下他的儿子
It was very cold yesterday ,( )we stayed at home
it can be either SO or Therefore,both meanings are the same.
( ) you are wrong ( ) he is
either or,because it doesn't make any sense if you use neither nor.
One cannot see air ,( ) it does exist .
however 意思是说 我们看不见空气 但是不管怎么样 空气还是存在的
hope these help