It is only when you lose something _____ how much you value it.
_____ the secret of nature, the young scientist has little time for entertainment.
— ? —Nothing serious, but a bit tired.
He was always _______ for knowledge, and at last became an expert in the field of art.
______ at the crossing and you will see a tall white building.
Rather than ______ at home playing cards on the Internet, I prefer _______ out for a day trip.