________ in his book, he didn't notice me ________ I entered the room.
Experience doesn't always _____ to the problem we are faced with.
A good friend is a person _______ we Turn for help when we are in trouble.
It was almost eight years Iater _____ the young man got his doctor's degree and became an engineer.
Lily managed to accomplish ______ the teacher encouraged her to do.
I've achieved a lot in my study, thanks to ____ who helped me.