By law, doctors are banned the kickback(回扣).
We should keep in mind that there’s usually ______ one way to solve the same problem.
The two families have ______ their disagreements in a friendly way, and this is what all of us expected to see.
She devoted herself ______ to her research and it earned her a good reputation in her field.
She always comes to our help when we get into trouble____ she is very busy.
He speaks English so well that he is thought of as a(n) ____ speaker.