Excuse me, Maria. Can I use your bike—Sure. Here you are. But you must return it _____ time.

下列各组中，划线字注音有误的一项是（ ）

Mary’s mother got sick, so she called ______

One of the biggest problems in food production has always been that people have no reliable access to exact information, ____________ is often the case in China

So mysteriously ______ missing that many puzzles wait to be solved.