Which sentence is punctuated correctly?

Because, we live at a high elevation, sometimes we have to adjust the cooking time for recipes.
I added bread, milk, and sugar to the list of ingredients needed to make the recipe.
Baking bread is one of my favorite things to do—on a weekend afternoon.
Before you leave for the store . . .check to make sure your grocery list is complete.

1 answer

The correctly punctuated sentence is:

"I added bread, milk, and sugar to the list of ingredients needed to make the recipe."

The other sentences contain punctuation errors.