用所给词的适当形式填空。(每空1分，共5分)
— Can you tell the ___________(different) between the two boys? — Oh, no. They look the same.
My grandpa is sitting ______ (comfortable) on the sofa.
His dream is to be a  _________ （succeed） writer.
I’m really looking forward to          (get) good grades.
Only two _____ (percent) of the students watch TV one to three times a week.