My English teacher is really ___．She is often seen working in her office far into the night．

Sam is a very good man. He always tries __________ best to help others.

People born under the Chinese sign of theTiger are attracted tofast cars and have strong need foremotionalindependence

It’s certainly been a long time_________ we met last time

Have you returned the book to the library ____—Yes， I have ____ returned it.