instruction:
In this task, you're given an input that contains two words, and your task is to predict the correct preposition that connects these two words. Predict the preposition that explicitly conveys both words' meaning, e.g., Word1: king 
 Word2: fort: "king of fort". Possible prepositions are: "of", "on", "in", "for", "from", "about", and "with".
question:
Word1: spacecraft 
 Word2: robot
answer:
for


question:
Word1: transaction 
 Word2: business
answer:
for


question:
Word1: atom 
 Word2: oxygen
answer:

of