Although I try to talk to my classmates, I still find _____ hard to make good friends with them.
—I remember you were a talented pianist at college. Can you play the piano for me?—Sorry, I __________ the piano for years.
In order to find the missing child, villagers __________ all they can over the past five hours.
During the last three decades, the number of people participating in physical fitness programs __________ sharply.
When I first met Bryan I didn't like him, but I __________ my mind.
—Oh no! We're too late. The train __________.—That's OK. We'll catch the next train to London.