The complete subject is The workmen
the complete predicate is repaired the damaged bridge
Aside from checking in the dictionary or from your own vocabulary, you can also know the meaning of the word through context clues. These context clues might be the words "basketball player" and "easily changing a light bulb". This must mean that enormously is synonymous to extremely.
D: Who makes recipes from the various countries, because this sentence needs a main clause to make sense.