He often helps his teachers and classmates, and is good at almost all his subjects.       , he is worthy of the honor of Top Students. 

What animal can live both ___ land and ___ the water.

Rock’n’roll was Black music that broke through to white culture when whites played the Blacks’ songs _______ the same style.

Was it an accident or did David do it ________?

I’ve arranged ___________ a car to send the children to the park, who have been divided _________ two groups.