Choose the correct word to complete the astronaut's complaint.

Packing for Mars is a nightmare because we have to wear ___ heavy spacesuits all day!

The correct answer is such.

We use such before plural nouns (like "spacesuits") or uncountable nouns, even when they have an adjective (like "heavy") describing them.

• We don't use "such a" because "spacesuits" is plural.

• We don't use "so" here because "so" is only used when the adjective or adverb stands alone without a noun (e.g., "The spacesuits are so heavy").