第 1 题 · 四级
Tired after the long trip, they dumped their bags on the floor and fell asleep.
核心词：dump dʌmp v. 倾倒，扔下
长途旅行后他们很累，把包扔在地板上就睡着了。
一般过去时过去分词状语 Tired + 并列谓语短语 dump one’s bags短语 a garbage dump
Tired after the long trip, they ___ their bags on the floor and fell asleep.
第 2 题 · 四级
The soldiers must be given rigorous training, or they cannot face the battle.
核心词：rigorous ˈrɪɡərəs adj. 严格的
士兵们必须接受严格训练，否则无法面对战斗。
一般现在时情态被动 must be given + or 并列句短语 rigorous training短语 a rigorous test
The soldiers must be given ___ training, or they cannot face the battle.
第 3 题 · 四级
Car makers refine their designs to make the cars safer and more comfortable.
核心词：refine rɪˈfaɪn v. 精炼，改善
汽车制造商精炼设计，使汽车更安全舒适。
一般现在时主谓宾 + 不定式目的状语 to make短语 refine a design短语 refined oil
Car makers ___ their designs to make the cars safer and more comfortable.
