第 1 题 · 四级
The factory emits smoke into the air, which the new law tries to stop.
核心词：emit iˈmit v. 发出，排放
工厂向空中排放烟雾，新法律试图制止。
一般现在时主谓宾 + into the air + which 从句 + try to do短语 emit smoke短语 emit light
The factory ___ smoke into the air, which the new law tries to stop.
第 2 题 · 四级
He is the heir to a large fortune, which he will receive when he grows up.
核心词：heir eə n. 继承人
他是一大笔财富的继承人，长大后将获得。
一般现在时be the heir to + which 从句 + when 时间状语短语 be the heir to短语 an heir apparent
He is the ___ to a large fortune, which he will receive when he grows up.
第 3 题 · 四级
She needs to work in pleasant surroundings, which the new office provides.
核心词：surroundings səˈraʊndɪŋz n. 环境
她需要在舒适的环境中工作，新办公室提供了这样的环境。
一般现在时need to do + in + 名词 + which 从句短语 pleasant surroundings短语 in one’s surroundings
She needs to work in pleasant ___, which the new office provides.
