急需2个at once造句

Everything happened at once. The view of the skyline is at once awesome, grand, and disappointing.
所有的事都一起发生了。天边立刻呈现出令人敬畏的、壮丽的和令人沮丧的景色
Leave the room at once.
马上离开这个房间

Sorry,i'll clean my bedroom at once.
对不起，我会马上把我的房间清理好的。
When he heard his wife was hurt in the traffic accident,he frove to the hospital at once.
当一听到他的妻子出了车祸，他立即开车赶赴医院。

Do it at once!
马上就做!

I will be back at once.
我马上回来