1 用how soon,因为in 100years是一个时间长度,不是准确时间.when的话通常是问一个固定的时间.
第二题要用on weekends,因为从usually和动词exercises加了s判断这是一般现在时,就是平时会做的事（不是昨天或者今天只做一次,而是有一定规律地在日常生活中都会做,就是一般现在时）,说明他不止是某个周末锻炼,而是很多周末都有锻炼这个习惯,所以要用weekends.
百分百把握的答There will be only one city in100 years （in 100 years
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