Correct Answer: threshold, dawn

Solution : The fourth option is correct.

The meanings of all the underlined words would be:

• A fairly foul day means that the day was moderately or reasonably unpleasant, possibly due to bad weather conditions or other unfavourable circumstances.
• Omens are signs or events believed to predict the future, whether they're seen as good or bad, based on various sources like nature, dreams, or symbolic occurrences.
• A threshold is a point of entry, transition, or boundary that marks the start of something new or signifies a decisive change or transition.
• Dawn refers to the early light that appears in the sky before sunrise, marking the start of a new day.
• Abundance refers to a plentiful or copious quantity of something. It denotes a state of having more than enough of a particular resource.
• A border is a dividing line or boundary that separates one geographic or political area from another, marking the limit or edge of a region, country, state, or territory.

Here, we can see that both the threshold and dawn represent moments of transition or new beginnings.