I _____(read)a history book when someone __(konck)at the door.

题目

I _____(read)a history book when someone __(konck)at the door.
the driver__(drive)home when it ___(rain)last night.
Doctor Liu was on duty last night.He ___still _(work)in the hospital at 10pm.
thank you for___(help)me carry the basket.
look!One of them____(swim)in the lake.

答案

was reading knocked
was driving was raining
was working
helping
is swimming