It was 4:25 a.m. _____ the ambulance arrived to take the body of Miss Lee.

下列各句中加点成语使用正确的一项是（ ）

Nowadays people are more concerned about the environment ___ they live.

Lastyear was a hard time to my friend Jim, but he didn’t_____ hope.

Four policemen rode past on their motorbikes, and then came the television broadcasting car, and the marathon(马拉松) runners.