If a computer crashes，you will lose the file you _____ on if you don’t save it early enough. 

.Its tiny eyes_____the cabbage,_____the creature’s interest in the vegetable.

—May I speak to your manager at 4：00 this afternoon? —Sorry, sir.  He ________  to a meeting soon.

Tom, you play the violin so well. But I ______ you can play the violin.

The two friends ______on the Internet for three hours, and they would go on till the next morning.