The girl was so absorbed _______her studies that she didn’t notice her friend walking towards her.
This colour TV is very expensive, but not_______.
Perseverance is a kind of quality--- and that is _____ it takes to do anything well.
He asked several questions_______ the professor who gave us a lecture_______the balance of nature.
We thought of selling this old furniture, but we’ve decided to _____ it. It might be valuable.
I’m not very good at playing chess. He often _______ me.