We don’t allow ___in the office. But you are allowed ____in the rest room.

People all around the world have been doing as much as they can ________the people in Afghanistan.

The girl ________at the party yesterday is missing today.

Everyone here will thank the firefighters for the things they did to prevent fires ________the environment safer.

The teacher asked us ________ in our reports before class.

Tom was the first ________ he was wrong.

Jack became seriously ill after ________ in polluted air for many years.

I’d love to watch the specially         dogs that can act as guides to the blind.

All kinds of promotion activities were launched,     for the May Holiday Market.

________ on the endless green grass are sheep, cattle and horses.