This is ____ my pen. I’m writing with ___ pen.
---How did you work out the difficult chemistry problem? --- I worked it out by ________.
By the time we rushed to the hall, the party ________ for ten minutes.
Jenny ________ some clothes to charity because the children in some poor areas need them.
The singer sang many songs, ________ some of my favorites.
I like the house in ________ I used to live.