Front

considerably

Back

to a great extent or degree

Front

the left of

Back

the side that is opposite to the right

Front

in the bottom left-hand corner

Back

the area located at the lower left corner

Front

top left-hand corner of

Back

the area located at the upper left corner

Front

to the right of

Back

the side that is opposite to the left

Front

infrastructure

Back

the basic physical and organizational structures needed for the operation of a society or enterprise

Front

previously

Back

at a time before the time of speaking or writing

Front

transform

Back

to make a thorough or dramatic change in form, appearance, or character

Front

once

Back

at one time; on one occasion

Front

erected

Back

to build or put up