第 1 题 · 高考
It is rude to spit on the ground, which the sign clearly warns.
核心词：spit spɪt vi. 吐痰
随地吐痰是不礼貌的，标牌上明确警告。
it 形式主语 + which 定语从句短语 spit on the ground短语 spit out
It is rude to ___ on the ground, which the sign clearly warns.
第 2 题 · 高考
The soldiers saluted the flag, which showed their deep respect.
核心词：salute səˈluːt vt. 致敬
士兵们向国旗敬礼，显示出深深的敬意。
一般过去时which 非限制性定语从句短语 salute sb短语 in salute
The soldiers ___ the flag, which showed their deep respect.
第 3 题 · 高考
They went on a safari to see wild animals, which excited the children.
核心词：safari səˈfɑːri n. 游猎之旅
他们去游猎观赏野生动物，孩子们很兴奋。
一般过去时go on a safari + which 定语从句短语 go on a safari短语 a safari park
They went on a ___ to see wild animals, which excited the children.
