Question

—You probably won't need to call Joe, but take his number, just ________.
—Thanks a lot.

A．at random	B．in return
C．in case	D．by heart

Answer 1

C

　——你可能不需要给Joe打电话，不过还是记下他的电话号码吧，以防万一。——谢谢！in case“以防万一”，符合语境。