your employer is still required to withhold social security and medicare from your wages.

How would the previous sentence be correctly capitalized?
Answer: Your employer is still required to withhold Social Security and Medicare from your wages.
these were difficult times ....

How would the previous sentence be correctly capitalized?
Answer: These were difficult times ....
alice did not at all like the tone of this remark, and thought it would be as well to introduce some other subject of conversation.

How would the previous sentence be correctly capitalized?
Answer: Alice did not at all like the tone of this remark, and thought it would be as well to introduce some other subject of conversation.
add onions & peppers stirring for 3-4 minutes, until softened; transfer to a bowl and set aside.

How would the previous sentence be correctly capitalized?
Answer: Add onions & peppers stirring for 3-4 minutes, until softened; transfer to a bowl and set aside.