蛏子chýng zi
参考答案：
蛏子，学名缢蛏，属软体动物，系瓣鳃纲，真瓣鳃且、竹蛏科，贝壳脆而薄呈长扁方型，自壳顶到腹缘，有一道斜行的凹沟，故名缢蛏。
Don't forget _______ the lights when you leave. [ ]
A. to turn off
B. turning off
C. turn off
D. turned off
