+0
1. the new building __ the left

2. His address is given __ the left of the card.

3. __ the left of John sat Mary.

4. sit __ sb.'s left

5. the store __ the left

6. visible __ the left

Which preposition should I use to fill in the above blanks, at, on or to?
+0
Maybe it's an American English thing, but I would use on for all of them. I don't find either at or to objectionable, however.

CJ
+0
I agree with the "American thing." On sounds fine for all of them, to my ears. But the others don't sound wrong.
Teachers: We supply a list of EFL job vacancies
Comments  
1. the new building __ the left on/to

2. His address is given __ the left of the card. on

3. __ the left of John sat Mary. at

4. sit __ sb.'s left at

5. the store __ the left on/to

6. visible __ the left on
 CalifJim's reply was promoted to an answer.
 BarbaraPA's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.