in a moment: 呆会儿
Tweedledee shouted fearfully.the two brothers turned to run and had disappeared in a moment.
俩兄弟转身拔腿就跑，一会儿就不见了。

in the middle of a task: 忙得不可开交
I’m in the middle of a task. And you have a customer.
我正忙你有客人

drop off: 脱下
You can go there and drop off your things.
你可以到那里把你的东西放下。
Where does the shuttle bus drop off passengers?
这趟车在哪下车？