There are five floors in the building. We live on floor.

The teacher used to stay up deep into the night ______, he made himself ill [ ]

st two years ______a sharp rise in oil price,which adds to the burden of auto transportation industry

In the reading room, we found her seated at a desk, her attention ____ on a novel.

rry, but there’s no smoking roomin this section on the train　—Oh, I _____ that, and I won’t smoke again