(2013·甘肃河西五市二模)Look! The ground is wet. It must have rained last night, ________？

Provide your doctor with a detailed medical history ______ he can give you the proper treatment.[ ]

He asked me how much ________ on the mountain bike

When ________ about one of the biggest concerns today, many people mention the sharp rise in prices[ ]

He was told that it would be at least three more months he could recover and return to work.[ ]