Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
He hurt her _________ badly _______ she had to see a doctor.
Look out! The traffic is moving fast. It's ________ dangerous ________ cross the street.
It's _______ far _______ walk home from here. Let's take a bus.
--------Why didn't Nick come to school yesterday? --------_______ he was ill.
John fell asleep _________ he was listening to the music.