It’s always difficult being in a foreign country , ____ when you can’t speak the local language .
The teacher came into the classroom _______ by his students.
_______ a little money, Jimmy was able to buy his mother a lovely new lamp.
Here are some new computer programs _______ for home buildings.
_______ with the size of the whole earth, the highest mountain does not seem high at all.
_______ a post office, I stopped _______ some stamps.