Which sentence is punctuated correctly?

Question

Because, we live at a high elevation, sometimes we have to adjust the cooking time for recipes.
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.
I added bread, milk, and sugar to the list of ingredients needed to make the recipe.

Before you leave for the store . . .check to make sure your grocery list is complete.
Before you leave for the store . . .check to make sure your grocery list is complete.

Baking bread is one of my favorite things to do—on a weekend afternoon.

Answer 1

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 such as misplaced commas and spacing issues. The correct version of the first sentence should be:

"Because we live at a high elevation, sometimes we have to adjust the cooking time for recipes."

The correct version of the third sentence should have a space after the ellipsis, like this:

"Before you leave for the store . . . check to make sure your grocery list is complete."

Lastly, the fourth sentence is also correct as is:

"Baking bread is one of my favorite things to do—on a weekend afternoon."