Definition: to begin a trip Level: B1
马丁在黎明前骑自行车出发了。
Martin ___set ___out on his bike ride before dawn.
你想什么时候出发？
When do you want to ___set ___out?
第二天早上，我打包好行李，出发前往法国。
Next morning I packed my luggage and ___set ___out on our trip to France.
