so...that...句子中"spoke fast说得快"fast为副词, 后面"I couldn't..."是一个完整的句子, 考查结果状语从句so...that...如此...以至于..., so后接形容词或副词, that后接句子, 注意, that后接否定句时可以用too...to...来转换, 这个句子可换成You spoke too fast for me to understand. Would you say it again? 故填: so...that.

这里是说客观事实用一般现在时, 如今now, 主语some parents一些父母, 对某人太严厉用be too hard on sb, 主语是复数, 故are, 他们的孩子their children, 故答案是Now some parents are too hard on their children.