Kelly, _______ girl, wants to be a policewoman.

Following the girl, we went into a hall, on ____ walls hung a few pictures of some famous scientists．

ou’ve got a "D" in chemistry．____—Well, I findthe subject hard and I think I’ll drop it for history next term．

don’t know ________ such a difficult matter.

I tried to call you last night, but I couldn’t ______.