第 1 题 · 六级
The street was full of filth and rubbish, which the busy cleaners have cleared away today.
核心词：filth fɪlθ n. 污秽，污物
街道上满是污物和垃圾，忙碌的清洁工今天清理掉了。
现在完成时主系表 + 介词短语 + which 从句（现在完成 + clear away）短语 a mound of filth短语 filth and rubbish
The street was full of ___ and rubbish, which the busy cleaners have cleared away today.
第 2 题 · 六级
The liquid will crystallize at fifty degrees, which the careful students have tested in the lab.
核心词：crystallize ˈkrɪstəlaɪz v. 结晶；使具体化
这种液体在五十度时会结晶，细心的学生们在实验室测试过。
现在完成时主谓 + 将来时 + 介词短语 + which 从句（现在完成 + in）短语 crystallize at短语 crystallize one’s ideas
The liquid will ___ at fifty degrees, which the careful students have tested in the lab.
第 3 题 · 六级
The clatter of the horses came from the road, which the curious children have heard from the window.
核心词：clatter ˈklætə n. 得得声，卡嗒声
路上传来嗒嗒的马蹄声，好奇的孩子们在窗口听到。
现在完成时主谓 + 介词短语 + 介词短语 + which 从句（现在完成 + from）短语 the clatter of hoofs短语 the clatter of dishes
The ___ of the horses came from the road, which the curious children have heard from the window.
