英语中相近词语的比较?

要选however,因为这个词用时要用逗号分开,可在句子中,前或后.而yet 是来连接句子与句子的,最后一个是though而不是although,though常放在句子末尾.
He was ill yesterday and yet he still came to school.
He was ill yesterday ,he still came to school,though.
He was ill yesterday,however,he still came to school.