第 1 题 · 四级
We had to stoop to pass through the low entrance, which made us laugh.
核心词：stoop stuːp v. 弯腰，俯身
我们得弯腰才能通过那低矮的入口，惹得我们笑起来。
一般过去时have to do + 目的状语 + which 从句短语 stoop to do短语 stoop to pass
We had to ___ to pass through the low entrance, which made us laugh.
第 2 题 · 四级
The cat crept into the room, trying to avoid the sleeping dog.
核心词：creep kriːp v. 爬行，缓慢地移动
猫蹑手蹑脚地溜进房间，想避开睡着的狗。
一般过去时现在分词作伴随状语 trying to短语 creep into短语 creep in
The cat ___ into the room, trying to avoid the sleeping dog.
第 3 题 · 四级
Doubtless there will be many changes, which the staff must get used to.
核心词：doubtless ˈdaʊtləs adv. 无疑地，很可能
无疑将会有许多变化，员工们必须适应。
一般将来时there be 将来时 + which 从句（情态）短语 doubtless there will be短语 get used to
___ there will be many changes, which the staff must get used to.
