根据句意,用适当的词填空。
1. —Xiao Hong,is this your bag?
― Yes, it is _______.
2. The boy is my friend, _______name is Tom.
3. This is a bird, _______ name is Polly.
4. —Li Lei, are those your English books?
—No,_______aren't.
5. Kate is a pretty girl. Yes, she_______very nice.