After an hour we stopped practicing. (HAD) // We ______________________________ for an hour when we stopped
We had been practicing for an hour when we stopped.
Jack is so arrogant I can't stand him. (SUCH) // I can't stand Jack because ________________________________ person
I can't stand Jack because he's such an arrogant person.
Her brother sings better than she does. (AS) // She doesn't __________________________ her brother.
She doesn't sing as well as her brother.