—Where do Dr. Kleitman and his assistant come from?—I’m not sure, but their English _____Australia.

Mr. Black was old, but able to _______quickly to changes in technology.

Practising Chinese kung fu can not only        one’s strength , but also develop one’s character .

Now these boys ______our football team.

Entering the orchard, you will find apple trees are ______ fruit, fragrance drifting around.