There are fifty students in our class, ______ are girls .
Practising Chinese kong fu can not only ______ one’s strength, but also develop one’s character.
Scientists are convinced ___ the positive effect of laughter ____ physical and mental health.
—Never say never, and you’ll make it.—That’s it. .
My uncle hasn’t been able to quit smoking, but at least he has .
—Can I pay the bill by check?—Sorry, sir. But it is the management rules of our hotel that payment be made in cash.