用合适的介词或副词填空 1. I will try my best to do the business _________ hand. 2. Stop talking and concentrate _________ your work. 3. I’ve seen them playing the piano ________ several occasions. 4. Aim for the best, prepare ___________ the worst. 5. The school and the parents have been ___________ close contact. 6. He has a great passion ___________ painting. 7. Have you ever thought about a career ___________ computer science? 8. She makes a living ___________ teaching music. 9. The whole room is filled ___________ bright sunlight. 10. He has developed ___________ a tall, strong man.