Complete the following sentences with proper prepositions or adverbs. 9. Their children have all grown _________ and left home now. 10. We can't run ______ the hallway when others are having classes. 11. A downpour (暴雨) of rain put ______ the children's bonfire (篝火). 12. Henry always seems so confident, but _____ reality he's very shy. 13. There are study questions _______ the end of each unit.