came in, I saw her sitting in the sofa ______in thought.

on is passion and it doesn’t matter____ it’s directed. Exactly, it can be coins or sports or politics.

I can’t remember how the tune goes, ______ I’ll recognize it when I hear it[ ]

you known each other for long—Not very long, __________ we started towork in the company.

d man fell down the front steps, knocked his head, and lost ________; when he woke up, he was back in his house.