第 1 题 · 四级
The story of the old castle fascinates children, who ask about it again and again.
核心词：fascinate ˈfæsɪneɪt v. 迷住，强烈吸引
古城堡的故事让孩子们着迷，他们一遍遍地问。
一般现在时一般现在时 + who 定语从句 + again and again短语 fascinate sb短语 again and again
The story of the old castle ___ children, who ask about it again and again.
第 2 题 · 四级
Fresh air circulates through the room, which keeps everyone awake.
核心词：circulate ˈsɜːkjʊleɪt v. 循环，流通
新鲜空气在房间里流通，让每个人都保持清醒。
一般现在时一般现在时 + which 从句 + keep sb adj短语 circulate through短语 blood circulation
Fresh air ___ through the room, which keeps everyone awake.
第 3 题 · 四级
This machine is a useful appliance, which saves the cook a lot of time.
核心词：appliance əˈplaɪəns n. 器具，电器
这台机器是一种有用的电器，为厨师节省了很多时间。
一般现在时主系表 + which 从句 + save sb sth短语 a household appliance短语 save time
This machine is a useful ___, which saves the cook a lot of time.
