1正确
2how much .How much do you weigh?=How heavy are you?=What's your weight?
3didn't until直到…才…
4don't will
5错误.How long多久了 你填的what time 是指什么时候,是一个时间点,而从题目来看,since指的是之后的一个时间段.
6错误.How tall.这是感叹句.How+形容词/副词+主语+剩余部分=What+名词（短语）+主语+剩余部分
比如说这句,How tall the lady is!=What a tall lady she is!