The harder you study, __________grades you’ll get.
I think this is ___ useful book, so I will keep it for ever.
Peter is a _______boy. His younger brother is _______.
—The supermarket is crowded(拥挤的). There are _______ people there.—Yeah, and the things there are always __________ expensive(贵的).
We all like ________animal. Because they are ______ interesting.
Could you tell me if Bob__________ the party? If he __________ , please tell me .