__________ you may have, you should gather your courage to face the challenge.
You have to keep on learning if you want to keep ______ with the development of modern science and technology.
The athlete fell off his bike when he _____ down the hill.
There is ______ is called Mr. Smith in our workshop.
Young students are ______ not to smoke, either in or out of school.
The reason he was absent from class was his mother fell ill this morning.