我们决定早点出发以避免交通堵塞。

We decided to ___head ___off early to avoid the traffic.

收拾好行李后，我们出发开始全国公路旅行。

After packing our bags, we ___headed ___off on our road trip across the country.

徒步者将在黎明出发，以便中午前到达山顶。

The hikers will ___head ___off at dawn to reach the summit by noon.