Engines are to machines _________ hearts are to animals.

We should know that we can only reach the top if we are ready to ____ and learn from failure.

Don’t start reading a book ________ youfind that it’s one you can read with ease and understanding

ehave yourself! If you keep on doing that, you’ll____ in serious trouble

Did you see Betty just now— Yes. She _____ someone, so I nodded to her and went away.