In the following sentence there are two blank spaces. Fill up the blank with the best pair of words in the option given below to make the sentence grammatically correct and meaningfully complete.

The tunnel was so ______ and congested, that we became ______ 

Key Points

• The tunnel being described as "dark" makes sense as tunnels are often poorly lit.
• The feeling of being "frightened" is a natural reaction to being in a dark and possibly unfamiliar place.
• The other options do not fit the context as appropriately. For instance, "long, enthusiastic" does not make sense as one would not typically feel enthusiastic in a long and congested tunnel.

​Therefore, the correct answer is 'Option 3'.

Complete Sentence: The tunnel was so dark and congested, that we became frightened.

Additional Information

• Long: Refers to a great distance from end to end.
• Enthusiastic: Means having or showing intense and eager enjoyment, interest, or approval.
• Deep: Refers to extending far down from the top or surface.
• Cautious: Means being careful to avoid potential problems or dangers.
• Crowded: Means filled with many people or things.
• Isolated: Means far away from other places, buildings, or people; remote.