Which one is correct? Beware: the cliff is steep.

Which one is correct? Melinda washed her dog, took out the garbage, and shampooed the carpet; nevertheless, the mysterious odor persisted. Melinda washed her dog, took out the garbage, and shampooed the carpet, nevertheless; the mysterious odor persisted.

Which one is correct? The ball game was exciting for the first two hours; but, it dragged on for four hours. The ball game was exciting for the first two hours, but it dragged on for four hours.

Which one is correct? The new house was bright, roomy, and freshly painted; the neighborhood was friendly; and the climate was warm and pleasant. The new house was bright, roomy, and freshly painted: the neighborhood was friendly, and the climate was warm and pleasant.

Which one is correct? Joann avoids places where people smoke—she says that—the smell makes her feel sick. Joann avoids places where people smoke. (She says that the smell makes her feel sick.)

Which one is correct? Before you board the plane, you must 1—go to the correct gate, 2—wait for your row to be called, and 3—give your ticket to the attendant. Before you board the plane, you must (1) go to the correct gate, (2) wait for your row to be called, and (3) give your ticket to the attendant.

Which one is correct? My source for the report—a book of facts—was written in 1995—but the information is—probably—still accurate. My source for the report—a book of facts—was written in 1995, but the information is probably still accurate.

Which one is correct? Hayrides, apple pies, and falling leaves—these are the reasons I love fall. Hayrides, apple pies, and falling leaves—(these are the reasons I love fall).

Which one is correct? Pioneers on their way to California faced many dangers: starvation, disease, and flooded rivers. Pioneers on their way to California faced many dangers: starvation; disease; and flooded rivers.

Which one is correct? A steady rain began to fall; nevertheless the football game continued. A steady rain began to fall; nevertheless, the football game continued.

Which one is correct? Yolanda’s new sweater—she says it’s from Peru is colorful and beautiful. Yolanda’s new sweater (she says it’s from Peru) is colorful and beautiful.

Which one is correct? The homeowner—a retired shipbuilder– has added structural details that remind him of his life at sea. The homeowner—a retired shipbuilder– has added structural details—that remind him of his life—at sea.